#define _FLAT_INPUT_H 1
#include "input.h"
+#include "init.h"
// A FlatInput is the normal, “classic” case of an input, where everything
// comes from a single 2D array with chunky pixels.
// mipmap generation) at that point.
void finalize();
- // TODO: Check that we actually have the required extension.
virtual bool can_output_linear_gamma() const {
- return (type == GL_UNSIGNED_BYTE &&
+ return (movit_srgb_textures_supported &&
+ type == GL_UNSIGNED_BYTE &&
(image_format.gamma_curve == GAMMA_LINEAR ||
image_format.gamma_curve == GAMMA_sRGB));
}
#include "opengl.h"
#include "util.h"
+#include <set>
+#include <string>
+
bool movit_initialized = false;
float movit_texel_subpixel_precision;
+bool movit_srgb_textures_supported;
namespace {
check_error();
}
+void get_extensions(std::set<std::string> *extensions)
+{
+ char *str = strdup(reinterpret_cast<const char *>(glGetString(GL_EXTENSIONS)));
+ for (char *ptr = strtok(str, " "); ptr != NULL; ptr = strtok(NULL, " ")) {
+ extensions->insert(ptr);
+ }
+ free(str);
+}
+
+void check_extensions()
+{
+ std::set<std::string> extensions;
+ get_extensions(&extensions);
+
+ // We fundamentally need FBOs and floating-point textures.
+ assert(extensions.count("GL_ARB_framebuffer_object") != 0);
+ assert(extensions.count("GL_ARB_texture_float") != 0);
+
+ // We assume that we can use non-power-of-two textures without restrictions.
+ assert(extensions.count("GL_ARB_texture_non_power_of_two") != 0);
+
+ // We also need GLSL fragment shaders.
+ assert(extensions.count("GL_ARB_fragment_shader") != 0);
+ assert(extensions.count("GL_ARB_shading_language_100") != 0);
+
+ // FlatInput and YCbCrInput uses PBOs. (They could in theory do without,
+ // but no modern card would really not provide it.)
+ assert(extensions.count("GL_ARB_pixel_buffer_object") != 0);
+
+ // ResampleEffect uses RG textures to encode a two-component LUT.
+ assert(extensions.count("GL_ARB_texture_rg") != 0);
+
+ // sRGB texture decode would be nice, but are not mandatory
+ // (GammaExpansionEffect can do the same thing if needed).
+ movit_srgb_textures_supported = extensions.count("GL_EXT_texture_sRGB");
+}
+
} // namespace
void init_movit()
glPixelStorei(GL_UNPACK_ALIGNMENT, 1);
measure_texel_subpixel_precision();
+ check_extensions();
movit_initialized = true;
}
#define _INIT_H
// Initialize the library; in particular, will query the GPU for information
-// that is needed by various components. (In time, for instance, we will query
-// about extensions here.)
+// that is needed by various components. For instance, it verifies that
+// we have all the OpenGL extensions we need.
void init_movit();
// GPU features. These are not intended for end-user use.
// We currently don't bother to test above 2^10.
extern float movit_texel_subpixel_precision;
+// Whether the GPU in use supports GL_EXT_texture_sRGB.
+extern bool movit_srgb_textures_supported;
+
#endif // !defined(_INIT_H)