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Diffstat (limited to 'source/blender/gpu/intern/gpu_shader.cc')
| -rw-r--r-- | source/blender/gpu/intern/gpu_shader.cc | 839 |
1 files changed, 839 insertions, 0 deletions
diff --git a/source/blender/gpu/intern/gpu_shader.cc b/source/blender/gpu/intern/gpu_shader.cc new file mode 100644 index 00000000000..2b54e733bf5 --- /dev/null +++ b/source/blender/gpu/intern/gpu_shader.cc @@ -0,0 +1,839 @@ +/* + * This program is free software; you can redistribute it and/or + * modify it under the terms of the GNU General Public License + * as published by the Free Software Foundation; either version 2 + * of the License, or (at your option) any later version. + * + * This program is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + * GNU General Public License for more details. + * + * You should have received a copy of the GNU General Public License + * along with this program; if not, write to the Free Software Foundation, + * Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA. + * + * The Original Code is Copyright (C) 2005 Blender Foundation. + * All rights reserved. + */ + +/** \file + * \ingroup gpu + */ + +#include "MEM_guardedalloc.h" + +#include "BLI_math_base.h" +#include "BLI_math_vector.h" +#include "BLI_path_util.h" +#include "BLI_string.h" +#include "BLI_string_utils.h" +#include "BLI_utildefines.h" + +#include "BKE_appdir.h" +#include "BKE_global.h" + +#include "DNA_space_types.h" + +#include "GPU_extensions.h" +#include "GPU_matrix.h" +#include "GPU_platform.h" +#include "GPU_shader.h" +#include "GPU_texture.h" +#include "GPU_uniformbuffer.h" + +#include "gpu_shader_private.h" + +extern "C" char datatoc_gpu_shader_colorspace_lib_glsl[]; + +/* Adjust these constants as needed. */ +#define MAX_DEFINE_LENGTH 256 +#define MAX_EXT_DEFINE_LENGTH 512 + +#ifndef NDEBUG +static uint g_shaderid = 0; +#endif + +/* -------------------------------------------------------------------- */ +/** \name Convenience functions + * \{ */ + +static void shader_print_errors(const char *task, const char *log, const char **code, int totcode) +{ + int line = 1; + + fprintf(stderr, "GPUShader: %s error:\n", task); + + for (int i = 0; i < totcode; i++) { + const char *c, *pos, *end = code[i] + strlen(code[i]); + + if (G.debug & G_DEBUG) { + fprintf(stderr, "===== shader string %d ====\n", i + 1); + + c = code[i]; + while ((c < end) && (pos = strchr(c, '\n'))) { + fprintf(stderr, "%2d ", line); + fwrite(c, (pos + 1) - c, 1, stderr); + c = pos + 1; + line++; + } + + fprintf(stderr, "%s", c); + } + } + + fprintf(stderr, "%s\n", log); +} + +static const char *gpu_shader_version(void) +{ + return "#version 330\n"; +} + +static void gpu_shader_standard_extensions(char defines[MAX_EXT_DEFINE_LENGTH]) +{ + /* enable extensions for features that are not part of our base GLSL version + * don't use an extension for something already available! + */ + + if (GLEW_ARB_texture_gather) { + /* There is a bug on older Nvidia GPU where GL_ARB_texture_gather + * is reported to be supported but yield a compile error (see T55802). */ + if (!GPU_type_matches(GPU_DEVICE_NVIDIA, GPU_OS_ANY, GPU_DRIVER_ANY) || GLEW_VERSION_4_0) { + strcat(defines, "#extension GL_ARB_texture_gather: enable\n"); + + /* Some drivers don't agree on GLEW_ARB_texture_gather and the actual support in the + * shader so double check the preprocessor define (see T56544). */ + if (!GPU_type_matches(GPU_DEVICE_NVIDIA, GPU_OS_ANY, GPU_DRIVER_ANY) && !GLEW_VERSION_4_0) { + strcat(defines, "#ifdef GL_ARB_texture_gather\n"); + strcat(defines, "# define GPU_ARB_texture_gather\n"); + strcat(defines, "#endif\n"); + } + else { + strcat(defines, "#define GPU_ARB_texture_gather\n"); + } + } + } + if (GLEW_ARB_texture_query_lod) { + /* a #version 400 feature, but we use #version 330 maximum so use extension */ + strcat(defines, "#extension GL_ARB_texture_query_lod: enable\n"); + } + if (GLEW_ARB_shader_draw_parameters) { + strcat(defines, "#extension GL_ARB_shader_draw_parameters : enable\n"); + } + if (GPU_arb_texture_cube_map_array_is_supported()) { + strcat(defines, "#extension GL_ARB_texture_cube_map_array : enable\n"); + strcat(defines, "#define GPU_ARB_texture_cube_map_array\n"); + } +} + +static void gpu_shader_standard_defines(char defines[MAX_DEFINE_LENGTH]) +{ + /* some useful defines to detect GPU type */ + if (GPU_type_matches(GPU_DEVICE_ATI, GPU_OS_ANY, GPU_DRIVER_ANY)) { + strcat(defines, "#define GPU_ATI\n"); + if (GPU_crappy_amd_driver()) { + strcat(defines, "#define GPU_DEPRECATED_AMD_DRIVER\n"); + } + } + else if (GPU_type_matches(GPU_DEVICE_NVIDIA, GPU_OS_ANY, GPU_DRIVER_ANY)) { + strcat(defines, "#define GPU_NVIDIA\n"); + } + else if (GPU_type_matches(GPU_DEVICE_INTEL, GPU_OS_ANY, GPU_DRIVER_ANY)) { + strcat(defines, "#define GPU_INTEL\n"); + } + + /* some useful defines to detect OS type */ + if (GPU_type_matches(GPU_DEVICE_ANY, GPU_OS_WIN, GPU_DRIVER_ANY)) { + strcat(defines, "#define OS_WIN\n"); + } + else if (GPU_type_matches(GPU_DEVICE_ANY, GPU_OS_MAC, GPU_DRIVER_ANY)) { + strcat(defines, "#define OS_MAC\n"); + } + else if (GPU_type_matches(GPU_DEVICE_ANY, GPU_OS_UNIX, GPU_DRIVER_ANY)) { + strcat(defines, "#define OS_UNIX\n"); + } + + float derivatives_factors[2]; + GPU_get_dfdy_factors(derivatives_factors); + if (derivatives_factors[0] == 1.0f) { + strcat(defines, "#define DFDX_SIGN 1.0\n"); + } + else { + strcat(defines, "#define DFDX_SIGN -1.0\n"); + } + + if (derivatives_factors[1] == 1.0f) { + strcat(defines, "#define DFDY_SIGN 1.0\n"); + } + else { + strcat(defines, "#define DFDY_SIGN -1.0\n"); + } +} + +#define DEBUG_SHADER_NONE "" +#define DEBUG_SHADER_VERTEX "vert" +#define DEBUG_SHADER_FRAGMENT "frag" +#define DEBUG_SHADER_GEOMETRY "geom" + +/** + * Dump GLSL shaders to disk + * + * This is used for profiling shader performance externally and debug if shader code is correct. + * If called with no code, it simply bumps the shader index, so different shaders for the same + * program share the same index. + */ +static void gpu_dump_shaders(const char **code, const int num_shaders, const char *extension) +{ + if ((G.debug & G_DEBUG_GPU_SHADERS) == 0) { + return; + } + + /* We use the same shader index for shaders in the same program. + * So we call this function once before calling for the individual shaders. */ + static int shader_index = 0; + if (code == NULL) { + shader_index++; + BLI_assert(STREQ(DEBUG_SHADER_NONE, extension)); + return; + } + + /* Determine the full path of the new shader. */ + char shader_path[FILE_MAX]; + + char file_name[512] = {'\0'}; + sprintf(file_name, "%04d.%s", shader_index, extension); + + BLI_join_dirfile(shader_path, sizeof(shader_path), BKE_tempdir_session(), file_name); + + /* Write shader to disk. */ + FILE *f = fopen(shader_path, "w"); + if (f == NULL) { + printf("Error writing to file: %s\n", shader_path); + } + for (int j = 0; j < num_shaders; j++) { + fprintf(f, "%s", code[j]); + } + fclose(f); + printf("Shader file written to disk: %s\n", shader_path); +} + +/** \} */ + +/* -------------------------------------------------------------------- */ +/** \name Creation / Destruction + * \{ */ + +GPUShader *GPU_shader_create(const char *vertexcode, + const char *fragcode, + const char *geocode, + const char *libcode, + const char *defines, + const char *shname) +{ + return GPU_shader_create_ex( + vertexcode, fragcode, geocode, libcode, defines, GPU_SHADER_TFB_NONE, NULL, 0, shname); +} + +GPUShader *GPU_shader_create_from_python(const char *vertexcode, + const char *fragcode, + const char *geocode, + const char *libcode, + const char *defines) +{ + char *libcodecat = NULL; + + if (libcode == NULL) { + libcode = datatoc_gpu_shader_colorspace_lib_glsl; + } + else { + libcode = libcodecat = BLI_strdupcat(libcode, datatoc_gpu_shader_colorspace_lib_glsl); + } + + GPUShader *sh = GPU_shader_create_ex( + vertexcode, fragcode, geocode, libcode, defines, GPU_SHADER_TFB_NONE, NULL, 0, NULL); + + MEM_SAFE_FREE(libcodecat); + return sh; +} + +GPUShader *GPU_shader_load_from_binary(const char *binary, + const int binary_format, + const int binary_len, + const char *shname) +{ + BLI_assert(GL_ARB_get_program_binary); + int success; + int program = glCreateProgram(); + + glProgramBinary(program, binary_format, binary, binary_len); + glGetProgramiv(program, GL_LINK_STATUS, &success); + + if (success) { + glUseProgram(program); + + GPUShader *shader = (GPUShader *)MEM_callocN(sizeof(*shader), __func__); + shader->interface = GPU_shaderinterface_create(program); + shader->program = program; + +#ifndef NDEBUG + BLI_snprintf(shader->name, sizeof(shader->name), "%s_%u", shname, g_shaderid++); +#else + UNUSED_VARS(shname); +#endif + + return shader; + } + + glDeleteProgram(program); + return NULL; +} + +GPUShader *GPU_shader_create_ex(const char *vertexcode, + const char *fragcode, + const char *geocode, + const char *libcode, + const char *defines, + const eGPUShaderTFBType tf_type, + const char **tf_names, + const int tf_count, + const char *shname) +{ + GLint status; + GLchar log[5000]; + GLsizei length = 0; + GPUShader *shader; + char standard_defines[MAX_DEFINE_LENGTH] = ""; + char standard_extensions[MAX_EXT_DEFINE_LENGTH] = ""; + + shader = (GPUShader *)MEM_callocN(sizeof(GPUShader), "GPUShader"); + gpu_dump_shaders(NULL, 0, DEBUG_SHADER_NONE); + +#ifndef NDEBUG + BLI_snprintf(shader->name, sizeof(shader->name), "%s_%u", shname, g_shaderid++); +#else + UNUSED_VARS(shname); +#endif + + /* At least a vertex shader and a fragment shader are required. */ + BLI_assert((fragcode != NULL) && (vertexcode != NULL)); + + if (vertexcode) { + shader->vertex = glCreateShader(GL_VERTEX_SHADER); + } + if (fragcode) { + shader->fragment = glCreateShader(GL_FRAGMENT_SHADER); + } + if (geocode) { + shader->geometry = glCreateShader(GL_GEOMETRY_SHADER); + } + + shader->program = glCreateProgram(); + + if (!shader->program || (vertexcode && !shader->vertex) || (fragcode && !shader->fragment) || + (geocode && !shader->geometry)) { + fprintf(stderr, "GPUShader, object creation failed.\n"); + GPU_shader_free(shader); + return NULL; + } + + gpu_shader_standard_defines(standard_defines); + gpu_shader_standard_extensions(standard_extensions); + + if (vertexcode) { + const char *source[7]; + /* custom limit, may be too small, beware */ + int num_source = 0; + + source[num_source++] = gpu_shader_version(); + source[num_source++] = + "#define GPU_VERTEX_SHADER\n" + "#define IN_OUT out\n"; + source[num_source++] = standard_extensions; + source[num_source++] = standard_defines; + + if (geocode) { + source[num_source++] = "#define USE_GEOMETRY_SHADER\n"; + } + if (defines) { + source[num_source++] = defines; + } + source[num_source++] = vertexcode; + + gpu_dump_shaders(source, num_source, DEBUG_SHADER_VERTEX); + + glAttachShader(shader->program, shader->vertex); + glShaderSource(shader->vertex, num_source, source, NULL); + + glCompileShader(shader->vertex); + glGetShaderiv(shader->vertex, GL_COMPILE_STATUS, &status); + + if (!status) { + glGetShaderInfoLog(shader->vertex, sizeof(log), &length, log); + shader_print_errors("compile", log, source, num_source); + + GPU_shader_free(shader); + return NULL; + } + } + + if (fragcode) { + const char *source[8]; + int num_source = 0; + + source[num_source++] = gpu_shader_version(); + source[num_source++] = + "#define GPU_FRAGMENT_SHADER\n" + "#define IN_OUT in\n"; + source[num_source++] = standard_extensions; + source[num_source++] = standard_defines; + + if (geocode) { + source[num_source++] = "#define USE_GEOMETRY_SHADER\n"; + } + if (defines) { + source[num_source++] = defines; + } + if (libcode) { + source[num_source++] = libcode; + } + source[num_source++] = fragcode; + + gpu_dump_shaders(source, num_source, DEBUG_SHADER_FRAGMENT); + + glAttachShader(shader->program, shader->fragment); + glShaderSource(shader->fragment, num_source, source, NULL); + + glCompileShader(shader->fragment); + glGetShaderiv(shader->fragment, GL_COMPILE_STATUS, &status); + + if (!status) { + glGetShaderInfoLog(shader->fragment, sizeof(log), &length, log); + shader_print_errors("compile", log, source, num_source); + + GPU_shader_free(shader); + return NULL; + } + } + + if (geocode) { + const char *source[6]; + int num_source = 0; + + source[num_source++] = gpu_shader_version(); + source[num_source++] = "#define GPU_GEOMETRY_SHADER\n"; + source[num_source++] = standard_extensions; + source[num_source++] = standard_defines; + + if (defines) { + source[num_source++] = defines; + } + source[num_source++] = geocode; + + gpu_dump_shaders(source, num_source, DEBUG_SHADER_GEOMETRY); + + glAttachShader(shader->program, shader->geometry); + glShaderSource(shader->geometry, num_source, source, NULL); + + glCompileShader(shader->geometry); + glGetShaderiv(shader->geometry, GL_COMPILE_STATUS, &status); + + if (!status) { + glGetShaderInfoLog(shader->geometry, sizeof(log), &length, log); + shader_print_errors("compile", log, source, num_source); + + GPU_shader_free(shader); + return NULL; + } + } + + if (tf_names != NULL) { + glTransformFeedbackVaryings(shader->program, tf_count, tf_names, GL_INTERLEAVED_ATTRIBS); + /* Primitive type must be setup */ + BLI_assert(tf_type != GPU_SHADER_TFB_NONE); + shader->feedback_transform_type = tf_type; + } + + glLinkProgram(shader->program); + glGetProgramiv(shader->program, GL_LINK_STATUS, &status); + if (!status) { + glGetProgramInfoLog(shader->program, sizeof(log), &length, log); + /* print attached shaders in pipeline order */ + if (defines) { + shader_print_errors("linking", log, &defines, 1); + } + if (vertexcode) { + shader_print_errors("linking", log, &vertexcode, 1); + } + if (geocode) { + shader_print_errors("linking", log, &geocode, 1); + } + if (libcode) { + shader_print_errors("linking", log, &libcode, 1); + } + if (fragcode) { + shader_print_errors("linking", log, &fragcode, 1); + } + + GPU_shader_free(shader); + return NULL; + } + + glUseProgram(shader->program); + shader->interface = GPU_shaderinterface_create(shader->program); + + return shader; +} + +#undef DEBUG_SHADER_GEOMETRY +#undef DEBUG_SHADER_FRAGMENT +#undef DEBUG_SHADER_VERTEX +#undef DEBUG_SHADER_NONE + +void GPU_shader_free(GPUShader *shader) +{ +#if 0 /* Would be nice to have, but for now the Deferred compilation \ + * does not have a GPUContext. */ + BLI_assert(GPU_context_active_get() != NULL); +#endif + BLI_assert(shader); + + if (shader->vertex) { + glDeleteShader(shader->vertex); + } + if (shader->geometry) { + glDeleteShader(shader->geometry); + } + if (shader->fragment) { + glDeleteShader(shader->fragment); + } + if (shader->program) { + glDeleteProgram(shader->program); + } + + if (shader->interface) { + GPU_shaderinterface_discard(shader->interface); + } + + MEM_freeN(shader); +} + +static const char *string_join_array_maybe_alloc(const char **str_arr, bool *r_is_alloc) +{ + bool is_alloc = false; + if (str_arr == NULL) { + *r_is_alloc = false; + return NULL; + } + /* Skip empty strings (avoid alloc if we can). */ + while (str_arr[0] && str_arr[0][0] == '\0') { + str_arr++; + } + int i; + for (i = 0; str_arr[i]; i++) { + if (i != 0 && str_arr[i][0] != '\0') { + is_alloc = true; + } + } + *r_is_alloc = is_alloc; + if (is_alloc) { + return BLI_string_join_arrayN(str_arr, i); + } + else { + return str_arr[0]; + } +} + +/** + * Use via #GPU_shader_create_from_arrays macro (avoids passing in param). + * + * Similar to #DRW_shader_create_with_lib with the ability to include libs for each type of shader. + * + * It has the advantage that each item can be conditionally included + * without having to build the string inline, then free it. + * + * \param params: NULL terminated arrays of strings. + * + * Example: + * \code{.c} + * sh = GPU_shader_create_from_arrays({ + * .vert = (const char *[]){shader_lib_glsl, shader_vert_glsl, NULL}, + * .geom = (const char *[]){shader_geom_glsl, NULL}, + * .frag = (const char *[]){shader_frag_glsl, NULL}, + * .defs = (const char *[]){"#define DEFINE\n", test ? "#define OTHER_DEFINE\n" : "", NULL}, + * }); + * \endcode + */ +struct GPUShader *GPU_shader_create_from_arrays_impl( + const struct GPU_ShaderCreateFromArray_Params *params) +{ + struct { + const char *str; + bool is_alloc; + } str_dst[4] = {{0}}; + const char **str_src[4] = {params->vert, params->frag, params->geom, params->defs}; + + for (int i = 0; i < ARRAY_SIZE(str_src); i++) { + str_dst[i].str = string_join_array_maybe_alloc(str_src[i], &str_dst[i].is_alloc); + } + + GPUShader *sh = GPU_shader_create( + str_dst[0].str, str_dst[1].str, str_dst[2].str, NULL, str_dst[3].str, __func__); + + for (int i = 0; i < ARRAY_SIZE(str_dst); i++) { + if (str_dst[i].is_alloc) { + MEM_freeN((void *)str_dst[i].str); + } + } + return sh; +} + +/** \} */ + +/* -------------------------------------------------------------------- */ +/** \name Binding + * \{ */ + +void GPU_shader_bind(GPUShader *shader) +{ + BLI_assert(shader && shader->program); + + glUseProgram(shader->program); + GPU_matrix_bind(shader->interface); + GPU_shader_set_srgb_uniform(shader->interface); +} + +void GPU_shader_unbind(void) +{ + glUseProgram(0); +} + +/** \} */ + +/* -------------------------------------------------------------------- */ +/** \name Transform feedback + * \{ */ + +bool GPU_shader_transform_feedback_enable(GPUShader *shader, uint vbo_id) +{ + if (shader->feedback_transform_type == GPU_SHADER_TFB_NONE) { + return false; + } + + glBindBufferBase(GL_TRANSFORM_FEEDBACK_BUFFER, 0, vbo_id); + + switch (shader->feedback_transform_type) { + case GPU_SHADER_TFB_POINTS: + glBeginTransformFeedback(GL_POINTS); + return true; + case GPU_SHADER_TFB_LINES: + glBeginTransformFeedback(GL_LINES); + return true; + case GPU_SHADER_TFB_TRIANGLES: + glBeginTransformFeedback(GL_TRIANGLES); + return true; + default: + return false; + } +} + +void GPU_shader_transform_feedback_disable(GPUShader *UNUSED(shader)) +{ + glEndTransformFeedback(); +} + +/** \} */ + +/* -------------------------------------------------------------------- */ +/** \name Uniforms / Resource location + * \{ */ + +int GPU_shader_get_uniform(GPUShader *shader, const char *name) +{ + BLI_assert(shader && shader->program); + const GPUShaderInput *uniform = GPU_shaderinterface_uniform(shader->interface, name); + return uniform ? uniform->location : -1; +} + +int GPU_shader_get_builtin_uniform(GPUShader *shader, int builtin) +{ + BLI_assert(shader && shader->program); + return GPU_shaderinterface_uniform_builtin(shader->interface, + static_cast<GPUUniformBuiltin>(builtin)); +} + +int GPU_shader_get_builtin_block(GPUShader *shader, int builtin) +{ + BLI_assert(shader && shader->program); + return GPU_shaderinterface_block_builtin(shader->interface, + static_cast<GPUUniformBlockBuiltin>(builtin)); +} + +int GPU_shader_get_uniform_block(GPUShader *shader, const char *name) +{ + BLI_assert(shader && shader->program); + const GPUShaderInput *ubo = GPU_shaderinterface_ubo(shader->interface, name); + return ubo ? ubo->location : -1; +} + +int GPU_shader_get_uniform_block_binding(GPUShader *shader, const char *name) +{ + BLI_assert(shader && shader->program); + const GPUShaderInput *ubo = GPU_shaderinterface_ubo(shader->interface, name); + return ubo ? ubo->binding : -1; +} + +int GPU_shader_get_texture_binding(GPUShader *shader, const char *name) +{ + BLI_assert(shader && shader->program); + const GPUShaderInput *tex = GPU_shaderinterface_uniform(shader->interface, name); + return tex ? tex->binding : -1; +} + +int GPU_shader_get_attribute(GPUShader *shader, const char *name) +{ + BLI_assert(shader && shader->program); + const GPUShaderInput *attr = GPU_shaderinterface_attr(shader->interface, name); + return attr ? attr->location : -1; +} + +/** \} */ + +/* -------------------------------------------------------------------- */ +/** \name Getters + * \{ */ + +/* Clement : Temp */ +int GPU_shader_get_program(GPUShader *shader) +{ + return (int)shader->program; +} + +char *GPU_shader_get_binary(GPUShader *shader, uint *r_binary_format, int *r_binary_len) +{ + BLI_assert(GLEW_ARB_get_program_binary); + char *r_binary; + int binary_len = 0; + + glGetProgramiv(shader->program, GL_PROGRAM_BINARY_LENGTH, &binary_len); + r_binary = (char *)MEM_mallocN(binary_len, __func__); + glGetProgramBinary(shader->program, binary_len, NULL, r_binary_format, r_binary); + + if (r_binary_len) { + *r_binary_len = binary_len; + } + + return r_binary; +} + +/** \} */ + +/* -------------------------------------------------------------------- */ +/** \name Uniforms setters + * \{ */ + +void GPU_shader_uniform_float(GPUShader *UNUSED(shader), int location, float value) +{ + if (location == -1) { + return; + } + + glUniform1f(location, value); +} + +void GPU_shader_uniform_vector( + GPUShader *UNUSED(shader), int location, int length, int arraysize, const float *value) +{ + if (location == -1 || value == NULL) { + return; + } + + switch (length) { + case 1: + glUniform1fv(location, arraysize, value); + break; + case 2: + glUniform2fv(location, arraysize, value); + break; + case 3: + glUniform3fv(location, arraysize, value); + break; + case 4: + glUniform4fv(location, arraysize, value); + break; + case 9: + glUniformMatrix3fv(location, arraysize, 0, value); + break; + case 16: + glUniformMatrix4fv(location, arraysize, 0, value); + break; + default: + BLI_assert(0); + break; + } +} + +void GPU_shader_uniform_int(GPUShader *UNUSED(shader), int location, int value) +{ + if (location == -1) { + return; + } + + glUniform1i(location, value); +} + +void GPU_shader_uniform_vector_int( + GPUShader *UNUSED(shader), int location, int length, int arraysize, const int *value) +{ + if (location == -1) { + return; + } + + switch (length) { + case 1: + glUniform1iv(location, arraysize, value); + break; + case 2: + glUniform2iv(location, arraysize, value); + break; + case 3: + glUniform3iv(location, arraysize, value); + break; + case 4: + glUniform4iv(location, arraysize, value); + break; + default: + BLI_assert(0); + break; + } +} + +/** \} */ + +/* -------------------------------------------------------------------- */ +/** \name sRGB Rendering Workaround + * + * The viewport overlay frame-buffer is sRGB and will expect shaders to output display referred + * Linear colors. But other frame-buffers (i.e: the area frame-buffers) are not sRGB and require + * the shader output color to be in sRGB space + * (assumed display encoded color-space as the time of writing). + * For this reason we have a uniform to switch the transform on and off depending on the current + * frame-buffer color-space. + * \{ */ + +static int g_shader_builtin_srgb_transform = 0; + +void GPU_shader_set_srgb_uniform(const GPUShaderInterface *interface) +{ + int32_t loc = GPU_shaderinterface_uniform_builtin(interface, GPU_UNIFORM_SRGB_TRANSFORM); + if (loc != -1) { + glUniform1i(loc, g_shader_builtin_srgb_transform); + } +} + +void GPU_shader_set_framebuffer_srgb_target(int use_srgb_to_linear) +{ + g_shader_builtin_srgb_transform = use_srgb_to_linear; +} + +/** \} */ |