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Read texture data as RGBA from FBO on GLES 2.0

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Ray 2019-12-11 23:22:10 +01:00
parent 1397242d88
commit e614942a2d
2 changed files with 9 additions and 14 deletions
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12
src/rlgl.h
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@ -2904,15 +2904,9 @@ void *rlReadTexturePixels(Texture2D texture)
// NOTE: Previoust attached texture is automatically detached
glFramebufferTexture2D(GL_FRAMEBUFFER, GL_COLOR_ATTACHMENT0, GL_TEXTURE_2D, texture.id, 0);
// Allocate enough memory to read back our texture data
pixels = (unsigned char *)RL_MALLOC(GetPixelDataSize(texture.width, texture.height, texture.format));
// Get OpenGL internal formats and data type from our texture format
unsigned int glInternalFormat, glFormat, glType;
rlGetGlTextureFormats(texture.format, &glInternalFormat, &glFormat, &glType);
// NOTE: We read data as RGBA because FBO texture is configured as RGBA, despite binding a RGB texture...
glReadPixels(0, 0, texture.width, texture.height, glFormat, glType, pixels);
// We read data as RGBA because FBO texture is configured as RGBA, despite binding another texture format
pixels = (unsigned char *)RL_MALLOC(GetPixelDataSize(texture.width, texture.height, UNCOMPRESSED_R8G8B8A8));
glReadPixels(0, 0, texture.width, texture.height, UNCOMPRESSED_R8G8B8A8, GL_UNSIGNED_BYTE, pixels);
// Re-attach internal FBO color texture before deleting it
glFramebufferTexture2D(GL_FRAMEBUFFER, GL_COLOR_ATTACHMENT0, GL_TEXTURE_2D, fbo.texture.id, 0);

11
src/textures.c
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@ -773,11 +773,12 @@ Image GetTextureData(Texture2D texture)
image.format = texture.format;
image.mipmaps = 1;
// NOTE: Data retrieved on OpenGL ES 2.0 should be RGBA
// coming from FBO color buffer, but it seems original
// texture format is retrieved on RPI... weird...
//image.format = UNCOMPRESSED_R8G8B8A8;
#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...
image.format = UNCOMPRESSED_R8G8B8A8;
#endif
TraceLog(LOG_INFO, "Texture pixel data obtained successfully");
}
else TraceLog(LOG_WARNING, "Texture pixel data could not be obtained");