diff options
Diffstat (limited to 'video/out/opengl/formats.c')
| -rw-r--r-- | video/out/opengl/formats.c | 196 |
1 files changed, 196 insertions, 0 deletions
diff --git a/video/out/opengl/formats.c b/video/out/opengl/formats.c new file mode 100644 index 0000000..a0b79e2 --- /dev/null +++ b/video/out/opengl/formats.c @@ -0,0 +1,196 @@ +#include "common/common.h" +#include "formats.h" + +enum { + // --- GL type aliases (for readability) + T_U8 = GL_UNSIGNED_BYTE, + T_U16 = GL_UNSIGNED_SHORT, + T_FL = GL_FLOAT, +}; + +// List of allowed formats, and their usability for bilinear filtering and FBOs. +// This is limited to combinations that are useful for our renderer. +const struct gl_format gl_formats[] = { + // These are used for desktop GL 3+, and GLES 3+ with GL_EXT_texture_norm16. + {"r8", GL_R8, GL_RED, T_U8, F_CF | F_GL3 | F_GL2F | F_ES3}, + {"rg8", GL_RG8, GL_RG, T_U8, F_CF | F_GL3 | F_GL2F | F_ES3}, + {"rgb8", GL_RGB8, GL_RGB, T_U8, F_CF | F_GL3 | F_GL2F | F_ES3}, + {"rgba8", GL_RGBA8, GL_RGBA, T_U8, F_CF | F_GL3 | F_GL2F | F_ES3}, + {"r16", GL_R16, GL_RED, T_U16, F_CF | F_GL3 | F_GL2F | F_EXT16}, + {"rg16", GL_RG16, GL_RG, T_U16, F_CF | F_GL3 | F_GL2F | F_EXT16}, + {"rgb16", GL_RGB16, GL_RGB, T_U16, F_CF | F_GL3 | F_GL2F}, + {"rgba16", GL_RGBA16, GL_RGBA, T_U16, F_CF | F_GL3 | F_GL2F | F_EXT16}, + + // Specifically not color-renderable. + {"rgb16", GL_RGB16, GL_RGB, T_U16, F_TF | F_EXT16}, + + // GL2 legacy. Ignores possibly present FBO extensions (no CF flag set). + {"l8", GL_LUMINANCE8, GL_LUMINANCE, T_U8, F_TF | F_GL2}, + {"la8", GL_LUMINANCE8_ALPHA8, GL_LUMINANCE_ALPHA, T_U8, F_TF | F_GL2}, + {"rgb8", GL_RGB8, GL_RGB, T_U8, F_TF | F_GL2}, + {"rgba8", GL_RGBA8, GL_RGBA, T_U8, F_TF | F_GL2}, + {"l16", GL_LUMINANCE16, GL_LUMINANCE, T_U16, F_TF | F_GL2}, + {"la16", GL_LUMINANCE16_ALPHA16, GL_LUMINANCE_ALPHA, T_U16, F_TF | F_GL2}, + {"rgb16", GL_RGB16, GL_RGB, T_U16, F_TF | F_GL2}, + {"rgba16", GL_RGBA16, GL_RGBA, T_U16, F_TF | F_GL2}, + + // ES3 legacy. This is literally to compensate for Apple bugs in their iOS + // interop (can they do anything right?). ES3 still allows these formats, + // but they are deprecated. + {"l" , GL_LUMINANCE,GL_LUMINANCE, T_U8, F_CF | F_ES3}, + {"la",GL_LUMINANCE_ALPHA,GL_LUMINANCE_ALPHA, T_U8, F_CF | F_ES3}, + + // ES2 legacy + {"l" , GL_LUMINANCE,GL_LUMINANCE, T_U8, F_TF | F_ES2}, + {"la",GL_LUMINANCE_ALPHA,GL_LUMINANCE_ALPHA, T_U8, F_TF | F_ES2}, + {"rgb", GL_RGB, GL_RGB, T_U8, F_TF | F_ES2}, + {"rgba", GL_RGBA, GL_RGBA, T_U8, F_TF | F_ES2}, + + // Non-normalized integer formats. + // Follows ES 3.0 as to which are color-renderable. + {"r8ui", GL_R8UI, GL_RED_INTEGER, T_U8, F_CR | F_GL3 | F_ES3}, + {"rg8ui", GL_RG8UI, GL_RG_INTEGER, T_U8, F_CR | F_GL3 | F_ES3}, + {"rgb8ui", GL_RGB8UI, GL_RGB_INTEGER, T_U8, F_GL3 | F_ES3}, + {"rgba8ui", GL_RGBA8UI, GL_RGBA_INTEGER, T_U8, F_CR | F_GL3 | F_ES3}, + {"r16ui", GL_R16UI, GL_RED_INTEGER, T_U16, F_CR | F_GL3 | F_ES3}, + {"rg16ui", GL_RG16UI, GL_RG_INTEGER, T_U16, F_CR | F_GL3 | F_ES3}, + {"rgb16ui", GL_RGB16UI, GL_RGB_INTEGER, T_U16, F_GL3 | F_ES3}, + {"rgba16ui",GL_RGBA16UI, GL_RGBA_INTEGER, T_U16, F_CR | F_GL3 | F_ES3}, + + // On GL3+ or GL2.1 with GL_ARB_texture_float, floats work fully. + {"r16f", GL_R16F, GL_RED, T_FL, F_F16 | F_CF | F_GL3 | F_GL2F}, + {"rg16f", GL_RG16F, GL_RG, T_FL, F_F16 | F_CF | F_GL3 | F_GL2F}, + {"rgb16f", GL_RGB16F, GL_RGB, T_FL, F_F16 | F_CF | F_GL3 | F_GL2F}, + {"rgba16f", GL_RGBA16F, GL_RGBA, T_FL, F_F16 | F_CF | F_GL3 | F_GL2F}, + {"r32f", GL_R32F, GL_RED, T_FL, F_CF | F_GL3 | F_GL2F}, + {"rg32f", GL_RG32F, GL_RG, T_FL, F_CF | F_GL3 | F_GL2F}, + {"rgb32f", GL_RGB32F, GL_RGB, T_FL, F_CF | F_GL3 | F_GL2F}, + {"rgba32f", GL_RGBA32F, GL_RGBA, T_FL, F_CF | F_GL3 | F_GL2F}, + + // Note: we simply don't support float anything on ES2, despite extensions. + // We also don't bother with non-filterable float formats, and we ignore + // 32 bit float formats that are not blendable when rendering to them. + + // On ES3.2+, both 16 bit floats work fully (except 3-component formats). + // F_EXTF16 implies extensions that also enable 16 bit floats fully. + {"r16f", GL_R16F, GL_RED, T_FL, F_F16 | F_CF | F_ES32 | F_EXTF16}, + {"rg16f", GL_RG16F, GL_RG, T_FL, F_F16 | F_CF | F_ES32 | F_EXTF16}, + {"rgb16f", GL_RGB16F, GL_RGB, T_FL, F_F16 | F_TF | F_ES32 | F_EXTF16}, + {"rgba16f", GL_RGBA16F, GL_RGBA, T_FL, F_F16 | F_CF | F_ES32 | F_EXTF16}, + + // On ES3.0+, 16 bit floats are texture-filterable. + // Don't bother with 32 bit floats; they exist but are neither CR nor TF. + {"r16f", GL_R16F, GL_RED, T_FL, F_F16 | F_TF | F_ES3}, + {"rg16f", GL_RG16F, GL_RG, T_FL, F_F16 | F_TF | F_ES3}, + {"rgb16f", GL_RGB16F, GL_RGB, T_FL, F_F16 | F_TF | F_ES3}, + {"rgba16f", GL_RGBA16F, GL_RGBA, T_FL, F_F16 | F_TF | F_ES3}, + + // These might be useful as FBO formats. + {"rgb10_a2",GL_RGB10_A2, GL_RGBA, + GL_UNSIGNED_INT_2_10_10_10_REV, F_CF | F_GL3 | F_ES3}, + {"rgba12", GL_RGBA12, GL_RGBA, T_U16, F_CF | F_GL2 | F_GL3}, + {"rgb10", GL_RGB10, GL_RGB, T_U16, F_CF | F_GL2 | F_GL3}, + + // Special formats. + {"rgb565", GL_RGB8, GL_RGB, + GL_UNSIGNED_SHORT_5_6_5, F_TF | F_GL2 | F_GL3}, + // Worthless, but needed by OSX videotoolbox interop on old Apple hardware. + {"appleyp", GL_RGB, GL_RGB_422_APPLE, + GL_UNSIGNED_SHORT_8_8_APPLE, F_TF | F_APPL}, + + {0} +}; + +// Return an or-ed combination of all F_ flags that apply. +int gl_format_feature_flags(GL *gl) +{ + return (gl->version == 210 ? F_GL2 : 0) + | (gl->version >= 300 ? F_GL3 : 0) + | (gl->es == 200 ? F_ES2 : 0) + | (gl->es >= 300 ? F_ES3 : 0) + | (gl->es >= 320 ? F_ES32 : 0) + | (gl->mpgl_caps & MPGL_CAP_EXT16 ? F_EXT16 : 0) + | ((gl->es >= 300 && + (gl->mpgl_caps & MPGL_CAP_EXT_CR_HFLOAT)) ? F_EXTF16 : 0) + | ((gl->version == 210 && + (gl->mpgl_caps & MPGL_CAP_ARB_FLOAT) && + (gl->mpgl_caps & MPGL_CAP_TEX_RG) && + (gl->mpgl_caps & MPGL_CAP_FB)) ? F_GL2F : 0) + | (gl->mpgl_caps & MPGL_CAP_APPLE_RGB_422 ? F_APPL : 0); +} + +int gl_format_type(const struct gl_format *format) +{ + if (!format) + return 0; + if (format->type == GL_FLOAT) + return MPGL_TYPE_FLOAT; + if (gl_integer_format_to_base(format->format)) + return MPGL_TYPE_UINT; + return MPGL_TYPE_UNORM; +} + +// Return base internal format of an integer format, or 0 if it's not integer. +// "format" is like in struct gl_format. +GLenum gl_integer_format_to_base(GLenum format) +{ + switch (format) { + case GL_RED_INTEGER: return GL_RED; + case GL_RG_INTEGER: return GL_RG; + case GL_RGB_INTEGER: return GL_RGB; + case GL_RGBA_INTEGER: return GL_RGBA; + } + return 0; +} + +// Return the number of bytes per component this format implies. +// Returns 0 for formats with non-byte alignments and formats which +// merge multiple components (like GL_UNSIGNED_SHORT_5_6_5). +// "type" is like in struct gl_format. +int gl_component_size(GLenum type) +{ + switch (type) { + case GL_UNSIGNED_BYTE: return 1; + case GL_UNSIGNED_SHORT: return 2; + case GL_FLOAT: return 4; + } + return 0; +} + +// Return the number of separate color components. +// "format" is like in struct gl_format. +int gl_format_components(GLenum format) +{ + switch (format) { + case GL_RED: + case GL_RED_INTEGER: + case GL_LUMINANCE: + return 1; + case GL_RG: + case GL_RG_INTEGER: + case GL_LUMINANCE_ALPHA: + return 2; + case GL_RGB: + case GL_RGB_INTEGER: + return 3; + case GL_RGBA: + case GL_RGBA_INTEGER: + return 4; + } + return 0; +} + +// Return the number of bytes per pixel for the given format. +// Parameter names like in struct gl_format. +int gl_bytes_per_pixel(GLenum format, GLenum type) +{ + // Formats with merged components are special. + switch (type) { + case GL_UNSIGNED_INT_2_10_10_10_REV: return 4; + case GL_UNSIGNED_SHORT_5_6_5: return 2; + case GL_UNSIGNED_SHORT_8_8_APPLE: return 2; + case GL_UNSIGNED_SHORT_8_8_REV_APPLE: return 2; + } + + return gl_component_size(type) * gl_format_components(format); +} |