1 files changed, 51 insertions, 0 deletions
diff --git a/video/out/opengl/formats.h b/video/out/opengl/formats.h
new file mode 100644
index 0000000..f727a3b
--- /dev/null
+++ b/video/out/opengl/formats.h
@@ -0,0 +1,51 @@
+#ifndef MPGL_FORMATS_H_
+#define MPGL_FORMATS_H_
+
+#include "common.h"
+
+struct gl_format {
+    const char *name;           // symbolic name for user interaction/debugging
+    GLint internal_format;      // glTexImage argument
+    GLenum format;              // glTexImage argument
+    GLenum type;                // e.g. GL_UNSIGNED_SHORT
+    int flags;                  // F_* flags
+};
+
+enum {
+    // --- gl_format.flags
+
+    // Version flags. If at least 1 flag matches, the format entry is considered
+    // supported on the current GL context.
+    F_GL2       = 1 << 0, // GL2.1-only
+    F_GL3       = 1 << 1, // GL3.0 or later
+    F_ES2       = 1 << 2, // ES2-only
+    F_ES3       = 1 << 3, // ES3.0 or later
+    F_ES32      = 1 << 4, // ES3.2 or later
+    F_EXT16     = 1 << 5, // ES with GL_EXT_texture_norm16
+    F_EXTF16    = 1 << 6, // GL_EXT_color_buffer_half_float
+    F_GL2F      = 1 << 7, // GL2.1-only with texture_rg + texture_float + FBOs
+    F_APPL      = 1 << 8, // GL_APPLE_rgb_422
+
+    // Feature flags. They are additional and signal presence of features.
+    F_CR        = 1 << 16, // color-renderable
+    F_TF        = 1 << 17, // texture-filterable with GL_LINEAR
+    F_CF        = F_CR | F_TF,
+    F_F16       = 1 << 18, // uses half-floats (16 bit) internally, even though
+                           // the format is still GL_FLOAT (32 bit)
+
+    // --- Other constants.
+    MPGL_TYPE_UNORM = RA_CTYPE_UNORM,   // normalized integer (fixed point) formats
+    MPGL_TYPE_UINT  = RA_CTYPE_UINT,    // full integer formats
+    MPGL_TYPE_FLOAT = RA_CTYPE_FLOAT,   // float formats (both full and half)
+};
+
+extern const struct gl_format gl_formats[];
+
+int gl_format_feature_flags(GL *gl);
+int gl_format_type(const struct gl_format *format);
+GLenum gl_integer_format_to_base(GLenum format);
+int gl_component_size(GLenum type);
+int gl_format_components(GLenum format);
+int gl_bytes_per_pixel(GLenum format, GLenum type);
+
+#endif