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vo/opengl/formats: use R8 and RG8 formats on GL2.1 and ES2 if available #18264

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vo/opengl/formats: use R8 and RG8 formats on GL2.1 and ES2 if available #18264

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45da1fb
vo_gpu: opengl: support GL_EXT_framebuffer_object
anarsoul Jul 13, 2026
eb62325
vo_gpu: opengl: use R8/RG8 formats on GLES 2.0 and GL 2.1
anarsoul Jul 13, 2026
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20 changes: 20 additions & 0 deletions video/out/opengl/common.c
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Original file line number Diff line number Diff line change
Expand Up @@ -212,6 +212,26 @@ static const struct gl_functions gl_functions[] = {
.extension = "GL_EXT_unpack_subimage",
.provides = MPGL_CAP_ROW_LENGTH,
},
// Framebuffers, alternative extension name. Some GL 2.1 drivers (e.g.
// Mesa lima) expose only this one. It provides a compatible subset of
// GL_ARB_framebuffer_object for our purposes; the entrypoints loaded
// here are overwritten by the ARB/core ones below if available.
{
.ver_exclude = 300,
.ver_es_exclude = 200, // FBOs are core in ES2
.extension = "GL_EXT_framebuffer_object",
.provides = MPGL_CAP_FB,
.functions = (const struct gl_function[]) {
DEF_FN_NAME(BindFramebuffer, "glBindFramebufferEXT"),
DEF_FN_NAME(GenFramebuffers, "glGenFramebuffersEXT"),
DEF_FN_NAME(DeleteFramebuffers, "glDeleteFramebuffersEXT"),
DEF_FN_NAME(CheckFramebufferStatus, "glCheckFramebufferStatusEXT"),
DEF_FN_NAME(FramebufferTexture2D, "glFramebufferTexture2DEXT"),
DEF_FN_NAME(GetFramebufferAttachmentParameteriv,
"glGetFramebufferAttachmentParameterivEXT"),
{0}
},
},
// Framebuffers, extension in GL 2.x, core in GL 3.x core.
{
.ver_core = 300,
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6 changes: 6 additions & 0 deletions video/out/opengl/context.c
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Expand Up @@ -193,6 +193,12 @@ int ra_gl_ctx_color_depth(struct ra_swapchain *sw)
if ((gl->es < 300 && !gl->version) || !(gl->mpgl_caps & MPGL_CAP_FB))
return 0;

// The *_SIZE attachment queries need GL_ARB_framebuffer_object or
// GL 3.0+; GL_EXT_framebuffer_object does not provide them.
if (gl->version && gl->version < 300 &&
!gl_check_extension(gl->extensions, "GL_ARB_framebuffer_object"))
return 0;

gl->BindFramebuffer(GL_FRAMEBUFFER, p->main_fb);

GLenum obj = gl->version ? GL_BACK_LEFT : GL_BACK;
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19 changes: 18 additions & 1 deletion video/out/opengl/formats.c
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Expand Up @@ -24,6 +24,15 @@ const struct gl_format gl_formats[] = {
// Specifically not color-renderable.
{"rgb16", GL_RGB16, GL_RGB, T_U16, F_TF | F_EXT16},

// GL 2.1 with GL_ARB/EXT_texture_rg, but without requiring FBOs or float
// textures (unlike F_GL2F). Upload/filtering only.
{"r8", GL_R8, GL_RED, T_U8, F_TF | F_GL2RG},
{"rg8", GL_RG8, GL_RG, T_U8, F_TF | F_GL2RG},

// ES2 with GL_EXT_texture_rg. ES2 requires unsized internal formats.
{"r", GL_RED, GL_RED, T_U8, F_TF | F_ES2RG},
{"rg", GL_RG, GL_RG, T_U8, F_TF | F_ES2RG},

// 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},
Expand Down Expand Up @@ -104,7 +113,7 @@ const struct gl_format gl_formats[] = {
// 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)
int flags = (gl->version == 210 ? F_GL2 : 0)
| (gl->version >= 300 ? F_GL3 : 0)
| (gl->es == 200 ? F_ES2 : 0)
| (gl->es >= 300 ? F_ES3 : 0)
Expand All @@ -116,7 +125,15 @@ int gl_format_feature_flags(GL *gl)
(gl->mpgl_caps & MPGL_CAP_ARB_FLOAT) &&
(gl->mpgl_caps & MPGL_CAP_TEX_RG) &&
(gl->mpgl_caps & MPGL_CAP_FB)) ? F_GL2F : 0)
| ((gl->version == 210 &&
(gl->mpgl_caps & MPGL_CAP_TEX_RG)) ? F_GL2RG : 0)
| ((gl->es == 200 &&
(gl->mpgl_caps & MPGL_CAP_TEX_RG)) ? F_ES2RG : 0)
| (gl->mpgl_caps & MPGL_CAP_APPLE_RGB_422 ? F_APPL : 0);
// F_GL2RG is a subset of F_GL2F; avoid duplicate format entries.

@kasper93 kasper93 Jul 15, 2026

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Why? What is this fixing? F_GL2RG is non-float as I understand so why you bundle it with F_GL2F?

@anarsoul anarsoul Jul 17, 2026

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PR adds new entries for r8/rg8 formats (and r/rg for GLES2). Since F_GL2RG is a subset of F_GL2F (which is F_GL2RG + float textures + ARB_framebuffer_object), that would result in two r8/rg8 formats registered twice.

This particular line enforces mutual exclusivity - i.e. full color-renderable will be used with F_GL2F hardware, while filter-only fallback is only used on F_GL2RG

@anarsoul anarsoul Jul 17, 2026 •
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The logic is "clear F_GL2RG is F_GL2F is set", I hope it makes sense.

@kasper93 kasper93 Jul 23, 2026

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This particular line enforces mutual exclusivity - i.e. full color-renderable will be used with F_GL2F hardware, while filter-only fallback is only used on F_GL2RG

The format lookup always prefer formats higher on the lists. It's priority list of formats. So there is no issue in having lesser formats down the list. We already have duplication on master between F_GL2 and F_GL2F.

Either way, it's fine, just something that is rather not focused on main change.

if (flags & F_GL2F)
flags &= ~F_GL2RG;
return flags;
}

int gl_format_type(const struct gl_format *format)
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2 changes: 2 additions & 0 deletions video/out/opengl/formats.h
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Expand Up @@ -25,6 +25,8 @@ enum {
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
F_GL2RG = 1 << 9, // GL2.1-only with texture_rg (no float/FBO requirement)
F_ES2RG = 1 << 10, // ES2-only with GL_EXT_texture_rg

// Feature flags. They are additional and signal presence of features.
F_CR = 1 << 16, // color-renderable
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