X-Git-Url: https://git.sesse.net/?p=movit;a=blobdiff_plain;f=init.cpp;h=ce2ce5009c3b7412ea1d181c09c64260653bac8d;hp=d312cd8bd7e58eae1abdc7231a68b3532c8c138f;hb=f909bfe0621e8c844695ef327b71457893633cae;hpb=9c6b86affb570a2e2d18c6da795c359da393f9a3

diff --git a/init.cpp b/init.cpp
index d312cd8..ce2ce50 100644
--- a/init.cpp
+++ b/init.cpp
@@ -15,14 +15,14 @@ namespace movit {
 bool movit_initialized = false;
 MovitDebugLevel movit_debug_level = MOVIT_DEBUG_ON;
 float movit_texel_subpixel_precision;
-bool movit_timer_queries_supported;
+bool movit_timer_queries_supported, movit_compute_shaders_supported;
 int movit_num_wrongly_rounded;
 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
 // pointer instead (and never care to clean it up).
-string *movit_data_directory = NULL;
+string *movit_data_directory = nullptr;
 
 namespace {
 
@@ -38,7 +38,7 @@ void measure_texel_subpixel_precision()
 	check_error();
 	glBindTexture(GL_TEXTURE_2D, dst_texnum);
 	check_error();
-	glTexImage2D(GL_TEXTURE_2D, 0, GL_RGBA16F, width, 1, 0, GL_RGBA, GL_FLOAT, NULL);
+	glTexImage2D(GL_TEXTURE_2D, 0, GL_RGBA16F, width, 1, 0, GL_RGBA, GL_FLOAT, nullptr);
 	check_error();
 
 	glGenFramebuffers(1, &fbo);
@@ -166,7 +166,7 @@ void measure_roundoff_problems()
 	check_error();
 	glBindTexture(GL_TEXTURE_2D, dst_texnum);
 	check_error();
-	glTexImage2D(GL_TEXTURE_2D, 0, GL_RGBA8, 512, 1, 0, GL_RGBA, GL_UNSIGNED_BYTE, NULL);
+	glTexImage2D(GL_TEXTURE_2D, 0, GL_RGBA8, 512, 1, 0, GL_RGBA, GL_UNSIGNED_BYTE, nullptr);
 	check_error();
 
 	glGenFramebuffers(1, &fbo);
@@ -310,6 +310,16 @@ bool check_extensions()
 	movit_timer_queries_supported =
 		(epoxy_gl_version() >= 33 || epoxy_has_gl_extension("GL_ARB_timer_query"));
 
+	// Certain effects have compute shader implementations, which may be
+	// more efficient than the normal fragment shader versions.
+	// GLSL 3.10 supposedly also has compute shaders, but I haven't tested them,
+	// so we require desktop OpenGL.
+	movit_compute_shaders_supported =
+		(epoxy_is_desktop_gl() &&
+		 (epoxy_gl_version() >= 43 ||
+		  (epoxy_has_gl_extension("GL_ARB_compute_shader") &&
+		   epoxy_has_gl_extension("GL_ARB_shader_image_load_store"))));
+
 	return true;
 }
 
@@ -319,7 +329,7 @@ double get_glsl_version()
 
 	// Skip past the first period.
 	char *ptr = strchr(glsl_version_str, '.');
-	assert(ptr != NULL);
+	assert(ptr != nullptr);
 	++ptr;
 
 	// Now cut the string off at the next period or space, whatever comes first
@@ -341,6 +351,18 @@ double get_glsl_version()
 	return glsl_version;
 }
 
+void APIENTRY debug_callback(GLenum source,
+                             GLenum type,
+                             GLuint id,
+                             GLenum severity,
+                             GLsizei length,
+                             const char *message,
+                             const void *userParam)
+#ifdef __GNUC__
+	__attribute__((unused))
+#endif
+;
+
 void APIENTRY debug_callback(GLenum source,
                              GLenum type,
                              GLuint id,
@@ -371,7 +393,7 @@ bool init_movit(const string& data_directory, MovitDebugLevel debug_level)
 	// 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);
+	// glDebugMessageCallbackARB(callback, nullptr);
 	// glDebugMessageControlARB(GL_DONT_CARE, GL_DONT_CARE, GL_DONT_CARE, 0, 0, GL_TRUE);
 
 	if (!check_extensions()) {