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
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.
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.
check_error();
}
+struct RequiredExtension {
+ int min_equivalent_gl_version;
+ const char extension_name[64];
+};
+const RequiredExtension required_extensions[] = {
+ // 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.
+ { 15, "GL_ARB_framebuffer_object" },
+ { 30, "GL_ARB_texture_float" },
+
+ // We assume that we can use non-power-of-two textures without restrictions.
+ { 20, "GL_ARB_texture_non_power_of_two" },
+
+ // We also need GLSL fragment shaders.
+ { 20, "GL_ARB_fragment_shader" },
+ { 20, "GL_ARB_shading_language_100" },
+
+ // FlatInput and YCbCrInput uses PBOs. (They could in theory do without,
+ // but no modern card would really not provide it.)
+ { 21, "GL_ARB_pixel_buffer_object" },
+
+ // ResampleEffect uses RG textures to encode a two-component LUT.
+ // We also need GL_R several places, for single-channel input.
+ { 30, "GL_ARB_texture_rg" },
+};
+
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.
- //
- // Since we use implicit #version 100, we don't have round(). We will
- // fix this at some later stage.
if (!epoxy_is_desktop_gl()) {
if (epoxy_gl_version() >= 30) {
movit_srgb_textures_supported = true;
- movit_shader_rounding_supported = false;
+ movit_shader_rounding_supported = true;
+ return true;
} else {
+ fprintf(stderr, "Movit system requirements: GLES version %.1f is too old (GLES 3.0 needed).\n",
+ 0.1f * epoxy_gl_version());
+ fprintf(stderr, "Movit initialization failed.\n");
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.
- if (epoxy_gl_version() < 15 &&
- !epoxy_has_gl_extension("GL_ARB_framebuffer_object")) return false;
- if (epoxy_gl_version() < 30 &&
- !epoxy_has_gl_extension("GL_ARB_texture_float")) return false;
-
- // We assume that we can use non-power-of-two textures without restrictions.
- if (epoxy_gl_version() < 20 &&
- !epoxy_has_gl_extension("GL_ARB_texture_non_power_of_two")) return false;
-
- // We also need GLSL fragment shaders.
- if (epoxy_gl_version() < 20) {
- if (!epoxy_has_gl_extension("GL_ARB_fragment_shader")) return false;
- if (!epoxy_has_gl_extension("GL_ARB_shading_language_100")) return false;
+ // Check all extensions, and output errors for the ones that we are missing.
+ bool all_ok = true;
+ int gl_version = epoxy_gl_version();
+
+ for (unsigned i = 0; i < sizeof(required_extensions) / sizeof(required_extensions[0]); ++i) {
+ if (gl_version < required_extensions[i].min_equivalent_gl_version &&
+ !epoxy_has_gl_extension(required_extensions[i].extension_name)) {
+ fprintf(stderr, "Movit system requirements: Needs extension '%s' or at least OpenGL version %.1f (has version %.1f)\n",
+ required_extensions[i].extension_name,
+ 0.1f * required_extensions[i].min_equivalent_gl_version,
+ 0.1f * gl_version);
+ all_ok = false;
+ }
}
- // FlatInput and YCbCrInput uses PBOs. (They could in theory do without,
- // but no modern card would really not provide it.)
- if (epoxy_gl_version() < 21 &&
- !epoxy_has_gl_extension("GL_ARB_pixel_buffer_object")) return false;
-
- // ResampleEffect uses RG textures to encode a two-component LUT.
- if (epoxy_gl_version() < 30 &&
- !epoxy_has_gl_extension("GL_ARB_texture_rg")) return false;
+ if (!all_ok) {
+ fprintf(stderr, "Movit initialization failed.\n");
+ return false;
+ }
// sRGB texture decode would be nice, but are not mandatory
// (GammaExpansionEffect can do the same thing if needed).
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)
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();