X-Git-Url: https://git.sesse.net/?p=movit;a=blobdiff_plain;f=init.cpp;h=c37614e4c58de3e3be37ea93f804e2aeace978ea;hp=671c507c5588c7faf5783b7f0a500d1780fc9162;hb=refs%2Fheads%2Fepoxy;hpb=8c7e53028a3ef4805d2608643041a5d7e6bd1b6e diff --git a/init.cpp b/init.cpp index 671c507..c37614e 100644 --- a/init.cpp +++ b/init.cpp @@ -18,6 +18,7 @@ float movit_texel_subpixel_precision; bool movit_srgb_textures_supported; int movit_num_wrongly_rounded; bool movit_shader_rounding_supported; +MovitShaderModel movit_shader_model; // The rules for objects with nontrivial constructors in static scope // are somewhat convoluted, and easy to mess up. We simply have a @@ -38,7 +39,7 @@ void measure_texel_subpixel_precision() check_error(); glBindTexture(GL_TEXTURE_2D, dst_texnum); check_error(); - glTexImage2D(GL_TEXTURE_2D, 0, GL_RGBA16F_ARB, width, 1, 0, GL_RGBA, GL_UNSIGNED_BYTE, NULL); + glTexImage2D(GL_TEXTURE_2D, 0, GL_RGBA16F, width, 1, 0, GL_RGBA, GL_FLOAT, NULL); check_error(); glGenFramebuffers(1, &fbo); @@ -78,7 +79,8 @@ void measure_texel_subpixel_precision() glViewport(0, 0, width, 1); GLuint glsl_program_num = resource_pool.compile_glsl_program( - read_file("vs.vert"), read_file("texture1d.frag")); + read_version_dependent_file("vs", "vert"), + read_version_dependent_file("texture1d", "frag")); glUseProgram(glsl_program_num); check_error(); glUniform1i(glGetUniformLocation(glsl_program_num, "tex"), 0); // Bind the 2D sampler. @@ -122,14 +124,14 @@ void measure_texel_subpixel_precision() // Now read the data back and see what the card did. // (We only look at the red channel; the others will surely be the same.) // We assume a linear ramp; anything else will give sort of odd results here. - float out_data[width]; - glReadPixels(0, 0, width, 1, GL_RED, GL_FLOAT, out_data); + float out_data[width * 4]; + glReadPixels(0, 0, width, 1, GL_RGBA, GL_FLOAT, out_data); check_error(); float biggest_jump = 0.0f; for (unsigned i = 1; i < width; ++i) { - assert(out_data[i] >= out_data[i - 1]); - biggest_jump = max(biggest_jump, out_data[i] - out_data[i - 1]); + assert(out_data[i * 4] >= out_data[(i - 1) * 4]); + biggest_jump = max(biggest_jump, out_data[i * 4] - out_data[(i - 1) * 4]); } assert(biggest_jump > 0.0); @@ -209,7 +211,8 @@ void measure_roundoff_problems() glViewport(0, 0, 512, 1); GLuint glsl_program_num = resource_pool.compile_glsl_program( - read_file("vs.vert"), read_file("texture1d.frag")); + read_version_dependent_file("vs", "vert"), + read_version_dependent_file("texture1d", "frag")); glUseProgram(glsl_program_num); check_error(); glUniform1i(glGetUniformLocation(glsl_program_num, "tex"), 0); // Bind the 2D sampler. @@ -242,16 +245,16 @@ void measure_roundoff_problems() // Now read the data back and see what the card did. (Ignore the last value.) // (We only look at the red channel; the others will surely be the same.) - unsigned char out_data[512]; - glReadPixels(0, 0, 512, 1, GL_RED, GL_UNSIGNED_BYTE, out_data); + unsigned char out_data[512 * 4]; + glReadPixels(0, 0, 512, 1, GL_RGBA, GL_UNSIGNED_BYTE, out_data); check_error(); int wrongly_rounded = 0; for (unsigned i = 0; i < 255; ++i) { - if (out_data[i * 2 + 0] != i) { + if (out_data[(i * 2 + 0) * 4] != i) { ++wrongly_rounded; } - if (out_data[i * 2 + 1] != i + 1) { + if (out_data[(i * 2 + 1) * 4] != i + 1) { ++wrongly_rounded; } } @@ -277,6 +280,18 @@ void measure_roundoff_problems() bool check_extensions() { + // GLES generally doesn't use extensions as actively as desktop OpenGL. + // For now, we say that for GLES, we require GLES 3, which has everything + // we need. + if (!epoxy_is_desktop_gl()) { + if (epoxy_gl_version() >= 30) { + movit_srgb_textures_supported = true; + movit_shader_rounding_supported = true; + } else { + return false; + } + } + // We fundamentally need FBOs and floating-point textures. // FBOs are covered by OpenGL 1.5, and are not an extension there. // Floating-point textures are part of OpenGL 3.0 and newer. @@ -319,6 +334,42 @@ bool check_extensions() return true; } +double get_glsl_version() +{ + char *glsl_version_str = strdup((const char *)glGetString(GL_SHADING_LANGUAGE_VERSION)); + + // Skip past the first period. + char *ptr = strchr(glsl_version_str, '.'); + assert(ptr != NULL); + ++ptr; + + // Now cut the string off at the next period or space, whatever comes first + // (unless the string ends first). + while (*ptr && *ptr != '.' && *ptr != ' ') { + ++ptr; + } + *ptr = '\0'; + + // Now we have something on the form X.YY. We convert it to a float, and hope + // that if it's inexact (e.g. 1.30), atof() will round the same way the + // compiler will. + float glsl_version = atof(glsl_version_str); + free(glsl_version_str); + + return glsl_version; +} + +void APIENTRY debug_callback(GLenum source, + GLenum type, + GLuint id, + GLenum severity, + GLsizei length, + const char *message, + const void *userParam) +{ + printf("Debug: %s\n", message); +} + } // namespace bool init_movit(const string& data_directory, MovitDebugLevel debug_level) @@ -335,9 +386,27 @@ bool init_movit(const string& data_directory, MovitDebugLevel debug_level) glPixelStorei(GL_UNPACK_ALIGNMENT, 1); glDisable(GL_DITHER); + // You can turn this on if you want detailed debug messages from the driver. + // You should probably also ask for a debug context (see gtest_sdl_main.cpp), + // or you might not get much data back. + // glDebugMessageCallbackARB(callback, NULL); + // glDebugMessageControlARB(GL_DONT_CARE, GL_DONT_CARE, GL_DONT_CARE, 0, 0, GL_TRUE); + if (!check_extensions()) { return false; } + + // Find out what shader model we should compile for. + if (epoxy_is_desktop_gl()) { + if (get_glsl_version() >= 1.30) { + movit_shader_model = MOVIT_GLSL_130; + } else { + movit_shader_model = MOVIT_GLSL_110; + } + } else { + movit_shader_model = MOVIT_ESSL_300; + } + measure_texel_subpixel_precision(); measure_roundoff_problems();