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REVIEWED: LoadImageFromTexture() for Wasm https://github.com/raysan5/rguistyler/issues/10

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Let's see if it breaks on some other platform...
This commit is contained in:
Ray
2026-06-16 13:01:50 +02:00
parent 3973766b84
commit efef4e31dd
2 changed files with 18 additions and 7 deletions
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src/rlgl.h
+8
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@@ -3777,9 +3777,17 @@ void *rlReadTexturePixels(unsigned int id, int width, int height, int format)
// Attach our texture to FBO
glFramebufferTexture2D(GL_FRAMEBUFFER, GL_COLOR_ATTACHMENT0, GL_TEXTURE_2D, id, 0);
#if defined(FBO_READ_TEXTURE_AS_RGBA)
// Reading data as RGBA because FBO texture is configured as RGBA, despite binding another texture format
pixels = RL_CALLOC(rlGetPixelDataSize(width, height, RL_PIXELFORMAT_UNCOMPRESSED_R8G8B8A8), 1);
glReadPixels(0, 0, width, height, GL_RGBA, GL_UNSIGNED_BYTE, pixels);
#else
// Reading data as original texture format, in some platforms (RPI, Wasm) it works
pixels = (unsigned char *)RL_MALLOC(GetPixelDataSize(texture.width, texture.height, texture.format));
unsigned int glInternalFormat = 0, glFormat = 0, glType = 0;
rlGetGlTextureFormats(texture.format, &glInternalFormat, &glFormat, &glType);
glReadPixels(0, 0, texture.width, texture.height, glFormat, glType, pixels);
#endif
glBindFramebuffer(GL_FRAMEBUFFER, 0);
src/rtextures.c
+10 -7
View File
@@ -562,15 +562,18 @@ Image LoadImageFromTexture(Texture2D texture)
{
image.width = texture.width;
image.height = texture.height;
image.format = texture.format;
image.mipmaps = 1;
#if defined(GRAPHICS_API_OPENGL_ES2)
// NOTE: Data retrieved on OpenGL ES 2.0 should be RGBA,
// coming from FBO color buffer attachment, but it seems
// original texture format is retrieved on RPI...
#if defined(FBO_READ_TEXTURE_AS_RGBA)
// WARNING: On OpenGL ES 2.0/WebGL 1.0, there is no glGetTexImage() so,
// texture data is retrieved by creating an RGBA fbo, binding the texture
// to the fbo color attachment, and reading it as RGBA data with glReadPixels()
// Returned data *should* be RGBA but it seems on some platforms (RPI, WASM)
// original texture format is retrieved, so adding a define for this patch
image.format = PIXELFORMAT_UNCOMPRESSED_R8G8B8A8;
#else
image.format = texture.format;
#endif
image.mipmaps = 1;
TRACELOG(LOG_INFO, "TEXTURE: [ID %i] Pixel data retrieved successfully", texture.id);
}
else TRACELOG(LOG_WARNING, "TEXTURE: [ID %i] Failed to retrieve pixel data", texture.id);