render/gles2: Don't track has_alpha in pixel_format

Why track the alpha here when we can already get that information
elsewhere?

include/render/gles2.h

@@ -25,7 +25,6 @@ struct wlr_gles2_pixel_format {
 	// optional field, if empty then internalformat = format
 	GLint gl_internalformat;
 	GLint gl_format, gl_type;
-	bool has_alpha;
 };
 
 struct wlr_gles2_tex_shader {

render/gles2/pixel_format.c

@@ -2,6 +2,7 @@
 #include <GLES2/gl2.h>
 #include <GLES2/gl2ext.h>
 #include "render/gles2.h"
+#include "render/pixel_format.h"
 
 /*
  * The DRM formats are little endian while the GL formats are big endian,
@@ -12,100 +13,84 @@ static const struct wlr_gles2_pixel_format formats[] = {
 		.drm_format = DRM_FORMAT_ARGB8888,
 		.gl_format = GL_BGRA_EXT,
 		.gl_type = GL_UNSIGNED_BYTE,
-		.has_alpha = true,
 	},
 	{
 		.drm_format = DRM_FORMAT_XRGB8888,
 		.gl_format = GL_BGRA_EXT,
 		.gl_type = GL_UNSIGNED_BYTE,
-		.has_alpha = false,
 	},
 	{
 		.drm_format = DRM_FORMAT_XBGR8888,
 		.gl_format = GL_RGBA,
 		.gl_type = GL_UNSIGNED_BYTE,
-		.has_alpha = false,
 	},
 	{
 		.drm_format = DRM_FORMAT_ABGR8888,
 		.gl_format = GL_RGBA,
 		.gl_type = GL_UNSIGNED_BYTE,
-		.has_alpha = true,
 	},
 	{
 		.drm_format = DRM_FORMAT_BGR888,
 		.gl_format = GL_RGB,
 		.gl_type = GL_UNSIGNED_BYTE,
-		.has_alpha = false,
 	},
 #if WLR_LITTLE_ENDIAN
 	{
 		.drm_format = DRM_FORMAT_RGBX4444,
 		.gl_format = GL_RGBA,
 		.gl_type = GL_UNSIGNED_SHORT_4_4_4_4,
-		.has_alpha = false,
 	},
 	{
 		.drm_format = DRM_FORMAT_RGBA4444,
 		.gl_format = GL_RGBA,
 		.gl_type = GL_UNSIGNED_SHORT_4_4_4_4,
-		.has_alpha = true,
 	},
 	{
 		.drm_format = DRM_FORMAT_RGBX5551,
 		.gl_format = GL_RGBA,
 		.gl_type = GL_UNSIGNED_SHORT_5_5_5_1,
-		.has_alpha = false,
 	},
 	{
 		.drm_format = DRM_FORMAT_RGBA5551,
 		.gl_format = GL_RGBA,
 		.gl_type = GL_UNSIGNED_SHORT_5_5_5_1,
-		.has_alpha = true,
 	},
 	{
 		.drm_format = DRM_FORMAT_RGB565,
 		.gl_format = GL_RGB,
 		.gl_type = GL_UNSIGNED_SHORT_5_6_5,
-		.has_alpha = false,
 	},
 	{
 		.drm_format = DRM_FORMAT_XBGR2101010,
 		.gl_format = GL_RGBA,
 		.gl_type = GL_UNSIGNED_INT_2_10_10_10_REV_EXT,
-		.has_alpha = false,
 	},
 	{
 		.drm_format = DRM_FORMAT_ABGR2101010,
 		.gl_format = GL_RGBA,
 		.gl_type = GL_UNSIGNED_INT_2_10_10_10_REV_EXT,
-		.has_alpha = true,
 	},
 	{
 		.drm_format = DRM_FORMAT_XBGR16161616F,
 		.gl_format = GL_RGBA,
 		.gl_type = GL_HALF_FLOAT_OES,
-		.has_alpha = false,
 	},
 	{
 		.drm_format = DRM_FORMAT_ABGR16161616F,
 		.gl_format = GL_RGBA,
 		.gl_type = GL_HALF_FLOAT_OES,
-		.has_alpha = true,
 	},
 	{
 		.drm_format = DRM_FORMAT_XBGR16161616,
 		.gl_internalformat = GL_RGBA16_EXT,
 		.gl_format = GL_RGBA,
 		.gl_type = GL_UNSIGNED_SHORT,
-		.has_alpha = false,
 	},
 	{
 		.drm_format = DRM_FORMAT_ABGR16161616,
 		.gl_internalformat = GL_RGBA16_EXT,
 		.gl_format = GL_RGBA,
 		.gl_type = GL_UNSIGNED_SHORT,
-		.has_alpha = true,
 	},
 #endif
 };
@@ -151,11 +136,18 @@ const struct wlr_gles2_pixel_format *get_gles2_format_from_drm(uint32_t fmt) {
 const struct wlr_gles2_pixel_format *get_gles2_format_from_gl(
 		GLint gl_format, GLint gl_type, bool alpha) {
 	for (size_t i = 0; i < sizeof(formats) / sizeof(*formats); ++i) {
-		if (formats[i].gl_format == gl_format &&
-				formats[i].gl_type == gl_type &&
-				formats[i].has_alpha == alpha) {
-			return &formats[i];
+		if (formats[i].gl_format != gl_format ||
+				formats[i].gl_type != gl_type) {
+			continue;
+		}
+
+		const struct wlr_pixel_format_info *drm_fmt =
+			drm_get_pixel_format_info(formats[i].drm_format);
+		if (drm_fmt->has_alpha != alpha) {
+			continue;
 		}
+
+		return &formats[i];
 	}
 	return NULL;
 }

render/gles2/texture.c

@@ -216,7 +216,7 @@ static struct wlr_texture *gles2_texture_from_pixels(
 		return NULL;
 	}
 	texture->target = GL_TEXTURE_2D;
-	texture->has_alpha = fmt->has_alpha;
+	texture->has_alpha = drm_fmt->has_alpha;
 	texture->drm_format = fmt->drm_format;
 
 	GLint internal_format = fmt->gl_internalformat;