forked from bartvdbraak/blender
3d36489672
This commit contains all the remained parts needed for initial integration of OpenSubdiv into Blender's subdivision surface code. Includes both GPU and CPU backends which works in the following way: - When SubSurf modifier is the last in the modifiers stack then GPU pipeline of OpenSubdiv is used, making viewport performance as fast as possible. This also requires graphscard with GLSL 1.5 support. If this requirement is not met, then no GPU pipeline is used at all. - If SubSurf is not a last modifier or if DerivesMesh is being evaluated for rendering then CPU limit evaluation API from OpenSubdiv is used. This only replaces the legacy evaluation code from CCGSubSurf_legacy, but keeps CCG structures exactly the same as they used to be for ages now. This integration is fully covered with ifdef and not enabled by default because there are several TODOs to be solved first: - Face varying data interpolation is not really cleanly implemented for GPU in OpenSubdiv 3.0. It is also not implemented for limit evaluation API. This basically means we'll have really hard time supporting UVs. - Limit evaluation only works with adaptivly subdivided meshes so far, which basically means all the points of CCG are pushed to the limit. This gives different result from old code. - There are some serious optimizations possible on the topology refiner creation, which would speed up initial OpenSubdiv mesh creation. - There are some hardcoded asumptions in the GPU and DerivedMesh areas which could be generalized. That's something where Antony and Campbell can help, making it so the code is structured in a way which is reusable by all planned viewport projects. - There are also some workarounds in the dependency graph to make sure OpenGL buffers are only freed from the main thread. Those who'll be wanting to make experiments with this code should grab dev branch (NOT master) from https://github.com/Nazg-Gul/OpenSubdiv/tree/dev There are some patches applied in there which we're working on on getting into upstream.
655 lines
18 KiB
C++
655 lines
18 KiB
C++
/*
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* ***** BEGIN GPL LICENSE BLOCK *****
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* as published by the Free Software Foundation; either version 2
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* of the License, or (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software Foundation,
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* Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
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*
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* The Original Code is Copyright (C) 2013 Blender Foundation.
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* All rights reserved.
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*
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* Contributor(s): Sergey Sharybin
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*
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* ***** END GPL LICENSE BLOCK *****
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*/
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/* Do some compatibility hacks in order to make
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* the code working with GPU_material pipeline.
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*/
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#define GLSL_COMPAT_WORKAROUND
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#include "opensubdiv_capi.h"
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#ifdef _MSC_VER
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# include "iso646.h"
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#endif
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#include <cstdio>
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#include <cmath>
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#include <GL/glew.h>
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#include <opensubdiv/osd/glMesh.h>
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#ifdef OPENSUBDIV_HAS_CUDA
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# include <opensubdiv/osd/cudaGLVertexBuffer.h>
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#endif /* OPENSUBDIV_HAS_CUDA */
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#include <opensubdiv/osd/cpuGLVertexBuffer.h>
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#include <opensubdiv/osd/cpuEvaluator.h>
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#include "opensubdiv_partitioned.h"
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//using OpenSubdiv::FarPatchTables;
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using OpenSubdiv::Osd::GLMeshInterface;
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//sing OpenSubdiv::PartitionedGLMeshInterface;
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extern "C" char datatoc_gpu_shader_opensubd_display_glsl[];
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#define MAX_LIGHTS 8
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typedef struct Light {
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float position[4];
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float ambient[4];
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float diffuse[4];
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float specular[4];
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float spot_direction[4];
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float constant_attenuation;
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float linear_attenuation;
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float quadratic_attenuation;
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float spot_cutoff;
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float spot_exponent;
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float spot_cos_cutoff;
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float pad[2];
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} Light;
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typedef struct Lighting {
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Light lights[MAX_LIGHTS];
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int num_enabled;
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int pad[3];
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} Lighting;
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typedef struct Transform {
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float projection_matrix[16];
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float model_view_matrix[16];
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float normal_matrix[9];
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} Transform;
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static bool g_use_osd_glsl = false;
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static int g_active_uv_index = -1;
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static GLuint g_flat_fill_program = 0;
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static GLuint g_smooth_fill_program = 0;
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static GLuint g_wireframe_program = 0;
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static GLuint g_lighting_ub = 0;
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static Lighting g_lighting_data;
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static Transform g_transform;
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/* TODO(sergey): This is actually duplicated code from BLI. */
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namespace {
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void copy_m3_m3(float m1[3][3], float m2[3][3])
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{
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/* destination comes first: */
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memcpy(&m1[0], &m2[0], 9 * sizeof(float));
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}
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void copy_m3_m4(float m1[3][3], float m2[4][4])
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{
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m1[0][0] = m2[0][0];
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m1[0][1] = m2[0][1];
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m1[0][2] = m2[0][2];
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m1[1][0] = m2[1][0];
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m1[1][1] = m2[1][1];
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m1[1][2] = m2[1][2];
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m1[2][0] = m2[2][0];
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m1[2][1] = m2[2][1];
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m1[2][2] = m2[2][2];
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}
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void adjoint_m3_m3(float m1[3][3], float m[3][3])
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{
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m1[0][0] = m[1][1] * m[2][2] - m[1][2] * m[2][1];
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m1[0][1] = -m[0][1] * m[2][2] + m[0][2] * m[2][1];
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m1[0][2] = m[0][1] * m[1][2] - m[0][2] * m[1][1];
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m1[1][0] = -m[1][0] * m[2][2] + m[1][2] * m[2][0];
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m1[1][1] = m[0][0] * m[2][2] - m[0][2] * m[2][0];
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m1[1][2] = -m[0][0] * m[1][2] + m[0][2] * m[1][0];
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m1[2][0] = m[1][0] * m[2][1] - m[1][1] * m[2][0];
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m1[2][1] = -m[0][0] * m[2][1] + m[0][1] * m[2][0];
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m1[2][2] = m[0][0] * m[1][1] - m[0][1] * m[1][0];
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}
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float determinant_m3_array(float m[3][3])
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{
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return (m[0][0] * (m[1][1] * m[2][2] - m[1][2] * m[2][1]) -
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m[1][0] * (m[0][1] * m[2][2] - m[0][2] * m[2][1]) +
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m[2][0] * (m[0][1] * m[1][2] - m[0][2] * m[1][1]));
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}
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bool invert_m3_m3(float m1[3][3], float m2[3][3])
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{
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float det;
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int a, b;
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bool success;
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/* calc adjoint */
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adjoint_m3_m3(m1, m2);
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/* then determinant old matrix! */
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det = determinant_m3_array(m2);
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success = (det != 0.0f);
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if (det != 0.0f) {
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det = 1.0f / det;
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for (a = 0; a < 3; a++) {
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for (b = 0; b < 3; b++) {
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m1[a][b] *= det;
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}
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}
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}
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return success;
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}
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bool invert_m3(float m[3][3])
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{
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float tmp[3][3];
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bool success;
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success = invert_m3_m3(tmp, m);
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copy_m3_m3(m, tmp);
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return success;
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}
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void transpose_m3(float mat[3][3])
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{
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float t;
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t = mat[0][1];
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mat[0][1] = mat[1][0];
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mat[1][0] = t;
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t = mat[0][2];
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mat[0][2] = mat[2][0];
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mat[2][0] = t;
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t = mat[1][2];
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mat[1][2] = mat[2][1];
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mat[2][1] = t;
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}
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GLuint compileShader(GLenum shaderType,
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const char *section,
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const char *define)
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{
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const char *sources[3];
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char sdefine[64];
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sprintf(sdefine, "#define %s\n#define GLSL_COMPAT_WORKAROUND\n", section);
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sources[0] = define;
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sources[1] = sdefine;
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sources[2] = datatoc_gpu_shader_opensubd_display_glsl;
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GLuint shader = glCreateShader(shaderType);
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glShaderSource(shader, 3, sources, NULL);
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glCompileShader(shader);
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GLint status;
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glGetShaderiv(shader, GL_COMPILE_STATUS, &status);
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if (status == GL_FALSE) {
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GLchar emsg[1024];
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glGetShaderInfoLog(shader, sizeof(emsg), 0, emsg);
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fprintf(stderr, "Error compiling GLSL shader (%s): %s\n", section, emsg);
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fprintf(stderr, "Section: %s\n", sdefine);
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fprintf(stderr, "Defines: %s\n", define);
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fprintf(stderr, "Source: %s\n", sources[2]);
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exit(1);
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}
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return shader;
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}
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GLuint linkProgram(const char *define)
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{
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GLuint vertexShader = compileShader(GL_VERTEX_SHADER,
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"VERTEX_SHADER",
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define);
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GLuint geometryShader = compileShader(GL_GEOMETRY_SHADER,
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"GEOMETRY_SHADER",
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define);
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GLuint fragmentShader = compileShader(GL_FRAGMENT_SHADER,
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"FRAGMENT_SHADER",
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define);
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GLuint program = glCreateProgram();
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glAttachShader(program, vertexShader);
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glAttachShader(program, geometryShader);
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glAttachShader(program, fragmentShader);
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glBindAttribLocation(program, 0, "position");
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glBindAttribLocation(program, 1, "normal");
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#ifdef GLSL_COMPAT_WORKAROUND
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glProgramParameteriEXT(program,
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GL_GEOMETRY_INPUT_TYPE_EXT,
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GL_LINES_ADJACENCY_EXT);
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if (strstr(define, "WIREFRAME") == NULL) {
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glProgramParameteriEXT(program,
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GL_GEOMETRY_OUTPUT_TYPE_EXT,
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GL_TRIANGLE_STRIP);
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glProgramParameteriEXT(program,
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GL_GEOMETRY_VERTICES_OUT_EXT,
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4);
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}
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else {
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glProgramParameteriEXT(program,
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GL_GEOMETRY_OUTPUT_TYPE_EXT,
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GL_LINE_STRIP);
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glProgramParameteriEXT(program,
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GL_GEOMETRY_VERTICES_OUT_EXT,
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8);
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}
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#endif
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glLinkProgram(program);
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glDeleteShader(vertexShader);
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glDeleteShader(geometryShader);
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glDeleteShader(fragmentShader);
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GLint status;
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glGetProgramiv(program, GL_LINK_STATUS, &status);
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if (status == GL_FALSE) {
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GLchar emsg[1024];
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glGetProgramInfoLog(program, sizeof(emsg), 0, emsg);
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fprintf(stderr, "Error linking GLSL program : %s\n", emsg);
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fprintf(stderr, "Defines: %s\n", define);
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exit(1);
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}
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glUniformBlockBinding(program,
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glGetUniformBlockIndex(program, "Lighting"),
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0);
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glProgramUniform1i(program,
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glGetUniformLocation(program, "texture_buffer"),
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0); /* GL_TEXTURE0 */
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glProgramUniform1i(program,
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glGetUniformLocation(program, "FVarDataBuffer"),
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31); /* GL_TEXTURE31 */
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return program;
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}
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void bindProgram(PartitionedGLMeshInterface * /*mesh*/,
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int program)
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{
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glUseProgram(program);
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/* Matricies */
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glUniformMatrix4fv(glGetUniformLocation(program, "modelViewMatrix"),
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1, false,
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g_transform.model_view_matrix);
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glUniformMatrix4fv(glGetUniformLocation(program, "projectionMatrix"),
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1, false,
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g_transform.projection_matrix);
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glUniformMatrix3fv(glGetUniformLocation(program, "normalMatrix"),
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1, false,
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g_transform.normal_matrix);
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/* Ligthing */
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glBindBuffer(GL_UNIFORM_BUFFER, g_lighting_ub);
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glBufferSubData(GL_UNIFORM_BUFFER,
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0, sizeof(g_lighting_data), &g_lighting_data);
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glBindBuffer(GL_UNIFORM_BUFFER, 0);
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glBindBufferBase(GL_UNIFORM_BUFFER, 0, g_lighting_ub);
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/* Color */
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GLboolean use_lighting, use_color_material, use_texture_2d;
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glGetBooleanv(GL_LIGHTING, &use_lighting);
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glGetBooleanv(GL_COLOR_MATERIAL, &use_color_material);
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glGetBooleanv(GL_TEXTURE_2D, &use_texture_2d);
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glUniform1i(glGetUniformLocation(program, "use_color_material"),
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use_color_material);
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glUniform1i(glGetUniformLocation(program, "use_texture_2d"),
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use_texture_2d);
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if (use_lighting) {
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float color[4];
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glGetMaterialfv(GL_FRONT, GL_DIFFUSE, color);
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glUniform4fv(glGetUniformLocation(program, "diffuse"), 1, color);
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glGetMaterialfv(GL_FRONT, GL_SPECULAR, color);
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glUniform4fv(glGetUniformLocation(program, "specular"), 1, color);
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glGetMaterialfv(GL_FRONT, GL_SHININESS, color);
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glUniform1f(glGetUniformLocation(program, "shininess"), color[0]);
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}
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else {
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float color[4];
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glGetFloatv(GL_CURRENT_COLOR, color);
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glUniform4fv(glGetUniformLocation(program, "diffuse"), 1, color);
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}
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/* TODO(sergey): Bring face varying back. */
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#if 0
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/* Face-vertex data */
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if (mesh->GetDrawContext()->GetFvarDataTextureBuffer()) {
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glActiveTexture(GL_TEXTURE31);
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glBindTexture(GL_TEXTURE_BUFFER,
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mesh->GetDrawContext()->GetFvarDataTextureBuffer());
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glActiveTexture(GL_TEXTURE0);
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}
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#endif
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/* TODO(sergey): Bring face varying back. */
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glUniform1i(glGetUniformLocation(program, "osd_fvar_count"),
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0/* * mesh->GetFVarCount()*/);
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glUniform1i(glGetUniformLocation(program, "osd_active_uv_offset"),
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g_active_uv_index * 2);
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}
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} /* namespace */
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void openSubdiv_osdGLDisplayInit(void)
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{
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static bool need_init = true;
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if (need_init) {
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g_flat_fill_program = linkProgram("#define FLAT_SHADING\n");
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g_smooth_fill_program = linkProgram("#define SMOOTH_SHADING\n");
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g_wireframe_program = linkProgram("#define WIREFRAME\n");
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glGenBuffers(1, &g_lighting_ub);
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glBindBuffer(GL_UNIFORM_BUFFER, g_lighting_ub);
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glBufferData(GL_UNIFORM_BUFFER,
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sizeof(g_lighting_data), NULL, GL_STATIC_DRAW);
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need_init = false;
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}
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}
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void openSubdiv_osdGLDisplayDeinit(void)
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{
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if (g_lighting_ub != 0) {
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glDeleteBuffers(1, &g_lighting_ub);
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}
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if (g_flat_fill_program) {
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glDeleteProgram(g_flat_fill_program);
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}
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if (g_smooth_fill_program) {
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glDeleteProgram(g_flat_fill_program);
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}
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if (g_wireframe_program) {
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glDeleteProgram(g_wireframe_program);
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}
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}
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void openSubdiv_osdGLMeshDisplayPrepare(int use_osd_glsl,
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int active_uv_index)
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{
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g_use_osd_glsl = use_osd_glsl != 0;
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g_active_uv_index = active_uv_index;
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/* Update transformation matricies. */
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glGetFloatv(GL_PROJECTION_MATRIX, g_transform.projection_matrix);
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glGetFloatv(GL_MODELVIEW_MATRIX, g_transform.model_view_matrix);
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copy_m3_m4((float (*)[3])g_transform.normal_matrix,
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(float (*)[4])g_transform.model_view_matrix);
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invert_m3((float (*)[3])g_transform.normal_matrix);
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transpose_m3((float (*)[3])g_transform.normal_matrix);
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/* Update OpenGL lights positions, colors etc. */
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g_lighting_data.num_enabled = 0;
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for (int i = 0; i < MAX_LIGHTS; ++i) {
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GLboolean enabled;
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glGetBooleanv(GL_LIGHT0 + i, &enabled);
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if (enabled) {
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g_lighting_data.num_enabled++;
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}
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glGetLightfv(GL_LIGHT0 + i,
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GL_POSITION,
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g_lighting_data.lights[i].position);
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glGetLightfv(GL_LIGHT0 + i,
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GL_AMBIENT,
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g_lighting_data.lights[i].ambient);
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glGetLightfv(GL_LIGHT0 + i,
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GL_DIFFUSE,
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g_lighting_data.lights[i].diffuse);
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glGetLightfv(GL_LIGHT0 + i,
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GL_SPECULAR,
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g_lighting_data.lights[i].specular);
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glGetLightfv(GL_LIGHT0 + i,
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GL_SPOT_DIRECTION,
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g_lighting_data.lights[i].spot_direction);
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glGetLightfv(GL_LIGHT0 + i,
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GL_CONSTANT_ATTENUATION,
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&g_lighting_data.lights[i].constant_attenuation);
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glGetLightfv(GL_LIGHT0 + i,
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GL_LINEAR_ATTENUATION,
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&g_lighting_data.lights[i].linear_attenuation);
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glGetLightfv(GL_LIGHT0 + i,
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GL_QUADRATIC_ATTENUATION,
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&g_lighting_data.lights[i].quadratic_attenuation);
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glGetLightfv(GL_LIGHT0 + i,
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GL_SPOT_CUTOFF,
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&g_lighting_data.lights[i].spot_cutoff);
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glGetLightfv(GL_LIGHT0 + i,
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GL_SPOT_EXPONENT,
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&g_lighting_data.lights[i].spot_exponent);
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g_lighting_data.lights[i].spot_cos_cutoff =
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cos(g_lighting_data.lights[i].spot_cutoff);
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}
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}
|
|
|
|
static GLuint preapre_patchDraw(PartitionedGLMeshInterface *mesh,
|
|
bool fill_quads)
|
|
{
|
|
GLint program = 0;
|
|
if (!g_use_osd_glsl) {
|
|
glGetIntegerv(GL_CURRENT_PROGRAM, &program);
|
|
if (program) {
|
|
GLint model;
|
|
glGetIntegerv(GL_SHADE_MODEL, &model);
|
|
|
|
GLint location = glGetUniformLocation(program, "osd_flat_shading");
|
|
if (location != -1) {
|
|
glUniform1i(location, model == GL_FLAT);
|
|
}
|
|
|
|
/* TODO(sergey): Bring this back. */
|
|
#if 0
|
|
/* Face-vertex data */
|
|
if (mesh->GetDrawContext()->GetFvarDataTextureBuffer()) {
|
|
glActiveTexture(GL_TEXTURE31);
|
|
glBindTexture(GL_TEXTURE_BUFFER,
|
|
mesh->GetDrawContext()->GetFvarDataTextureBuffer());
|
|
glActiveTexture(GL_TEXTURE0);
|
|
|
|
GLint location = glGetUniformLocation(program, "osd_fvar_count");
|
|
if (location != -1) {
|
|
glUniform1i(location, mesh->GetFVarCount());
|
|
}
|
|
|
|
location = glGetUniformLocation(program, "osd_active_uv_offset");
|
|
if (location != -1) {
|
|
glUniform1i(location,
|
|
g_active_uv_index * 2);
|
|
}
|
|
}
|
|
#endif
|
|
|
|
}
|
|
return program;
|
|
}
|
|
|
|
program = g_smooth_fill_program;
|
|
if (fill_quads) {
|
|
int model;
|
|
glGetIntegerv(GL_SHADE_MODEL, &model);
|
|
if (model == GL_FLAT) {
|
|
program = g_flat_fill_program;
|
|
}
|
|
}
|
|
else {
|
|
glPolygonMode(GL_FRONT_AND_BACK, GL_LINE);
|
|
program = g_wireframe_program;
|
|
}
|
|
|
|
bindProgram(mesh, program);
|
|
|
|
return program;
|
|
}
|
|
|
|
static void perform_drawElements(GLuint program,
|
|
int patch_index,
|
|
int num_elements,
|
|
int start_element)
|
|
{
|
|
int mode = GL_QUADS;
|
|
if (program) {
|
|
glUniform1i(glGetUniformLocation(program, "PrimitiveIdBase"),
|
|
patch_index);
|
|
}
|
|
mode = GL_LINES_ADJACENCY;
|
|
glDrawElements(mode,
|
|
num_elements,
|
|
GL_UNSIGNED_INT,
|
|
(void *)(start_element * sizeof(unsigned int)));
|
|
}
|
|
|
|
static void finish_patchDraw(bool fill_quads)
|
|
{
|
|
/* TODO(sergey): Some of the stuff could be done once after the whole
|
|
* mesh is displayed.
|
|
*/
|
|
|
|
/* Restore state. */
|
|
if (!fill_quads) {
|
|
glPolygonMode(GL_FRONT_AND_BACK, GL_FILL);
|
|
}
|
|
glBindVertexArray(0);
|
|
|
|
if (g_use_osd_glsl) {
|
|
/* TODO(sergey): Store previously used program and roll back to it? */
|
|
glUseProgram(0);
|
|
}
|
|
}
|
|
|
|
#if 0
|
|
static void draw_partition_patches_range(PartitionedGLMeshInterface *mesh,
|
|
GLuint program,
|
|
int start_partition,
|
|
int num_partitions)
|
|
{
|
|
/* Glue patches from all partitions in the range together. */
|
|
int patch_index = -1, start_element = -1, num_elements = 0;
|
|
for (int partition = start_partition;
|
|
partition < start_partition + num_partitions;
|
|
++partition)
|
|
{
|
|
OsdDrawContext::PatchArrayVector const &patches =
|
|
mesh->GetPatchArrays(partition);
|
|
for (int i = 0; i < (int)patches.size(); ++i) {
|
|
OsdDrawContext::PatchArray const &patch = patches[i];
|
|
OsdDrawContext::PatchDescriptor desc = patch.GetDescriptor();
|
|
OpenSubdiv::FarPatchTables::Type patchType = desc.GetType();
|
|
if (patchType == OpenSubdiv::FarPatchTables::QUADS) {
|
|
if (start_element == -1) {
|
|
patch_index = patch.GetPatchIndex();
|
|
start_element = patch.GetVertIndex();
|
|
}
|
|
|
|
assert(patch.GetVertIndex() == start_element + num_elements);
|
|
num_elements += patch.GetNumIndices();
|
|
}
|
|
else {
|
|
assert(!"Discontinuitied are not supported yet.");
|
|
}
|
|
}
|
|
}
|
|
|
|
/* Perform actual draw. */
|
|
perform_drawElements(program,
|
|
patch_index,
|
|
num_elements,
|
|
start_element);
|
|
}
|
|
#endif
|
|
|
|
static void draw_all_patches(PartitionedGLMeshInterface *mesh,
|
|
GLuint program)
|
|
{
|
|
const OpenSubdiv::Osd::PatchArrayVector& patches =
|
|
mesh->GetPatchTable()->GetPatchArrays();
|
|
for (int i = 0; i < (int)patches.size(); ++i) {
|
|
const OpenSubdiv::Osd::PatchArray& patch = patches[i];
|
|
OpenSubdiv::Far::PatchDescriptor desc = patch.GetDescriptor();
|
|
OpenSubdiv::Far::PatchDescriptor::Type patchType = desc.GetType();
|
|
|
|
if (patchType == OpenSubdiv::Far::PatchDescriptor::QUADS) {
|
|
perform_drawElements(program,
|
|
i,
|
|
patch.GetNumPatches() * desc.GetNumControlVertices(),
|
|
patch.GetIndexBase());
|
|
}
|
|
}
|
|
}
|
|
|
|
void openSubdiv_osdGLMeshDisplay(OpenSubdiv_GLMesh *gl_mesh,
|
|
int fill_quads,
|
|
int start_partition,
|
|
int num_partitions)
|
|
{
|
|
PartitionedGLMeshInterface *mesh =
|
|
(PartitionedGLMeshInterface *)(gl_mesh->descriptor);
|
|
|
|
/* Make sure all global invariants are initialized. */
|
|
openSubdiv_osdGLDisplayInit();
|
|
|
|
/* Setup GLSL/OpenGL to draw patches in current context. */
|
|
GLuint program = preapre_patchDraw(mesh, fill_quads != 0);
|
|
|
|
if (start_partition != -1) {
|
|
#if 0
|
|
draw_partition_patches_range(mesh,
|
|
program,
|
|
start_partition,
|
|
num_partitions);
|
|
#else
|
|
(void)num_partitions;
|
|
if(start_partition == 0) {
|
|
draw_all_patches(mesh, program);
|
|
}
|
|
#endif
|
|
}
|
|
else {
|
|
draw_all_patches(mesh, program);
|
|
}
|
|
|
|
/* Finish patch drawing by restoring all changes to the OpenGL context. */
|
|
finish_patchDraw(fill_quads != 0);
|
|
}
|