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Do a blit to readback luminance and luminance alpha images on GLES

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baldurk
2018-10-29 18:29:21 +00:00
parent 24a9ef9093
commit cc2f596b1a
1 changed files with 19 additions and 6 deletions
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renderdoc/driver/gl/wrappers/gl_emulated.cpp
+19 -6
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@@ -1685,9 +1685,13 @@ void APIENTRY _glGetTexImage(GLenum target, GLint level, GLenum format, GLenum t
PushPopFramebuffer(eGL_FRAMEBUFFER, fbo);
// ALPHA can't be bound to an FBO, so we need to blit to R8 by hand.
if(format == eGL_ALPHA)
if(format == eGL_LUMINANCE_ALPHA || format == eGL_LUMINANCE || format == eGL_ALPHA)
{
RDCDEBUG("Doing manual blit from GL_ALPHA -> GL_R8 to allow readback");
RDCDEBUG("Doing manual blit from %s to allow readback", ToStr(format).c_str());
GLenum remapformat = eGL_RED;
if(format == eGL_LUMINANCE_ALPHA)
remapformat = eGL_RG;
GLint baseLevel = 0;
GLint maxLevel = 0;
@@ -1705,7 +1709,7 @@ void APIENTRY _glGetTexImage(GLenum target, GLint level, GLenum format, GLenum t
// allocate the R8 texture
GL.glTexParameteri(target, eGL_TEXTURE_MAX_LEVEL, 0);
GL.glTexImage2D(target, 0, eGL_R8, width, height, 0, eGL_RED, eGL_UNSIGNED_BYTE, NULL);
GL.glTexImage2D(target, 0, eGL_R8, width, height, 0, remapformat, eGL_UNSIGNED_BYTE, NULL);
// render to it
GL.glFramebufferTexture2D(eGL_FRAMEBUFFER, eGL_COLOR_ATTACHMENT0, target, readtex, 0);
@@ -1735,11 +1739,20 @@ void APIENTRY _glGetTexImage(GLenum target, GLint level, GLenum format, GLenum t
"attribute vec2 pos;\n"
"void main() { gl_Position = vec4(pos, 0.5, 0.5); }";
const char *fs =
char fs_src[] =
"precision highp float;\n"
"uniform vec2 res;\n"
"uniform sampler2D srcTex;\n"
"void main() { gl_FragColor = texture2D(srcTex, vec2(gl_FragCoord.xy)/res).aaaa; }";
"void main() { gl_FragColor = texture2D(srcTex, vec2(gl_FragCoord.xy)/res).?aaa; }";
char *swizzle = strchr(fs_src, '?');
if(format == eGL_ALPHA)
*swizzle = 'a';
else
*swizzle = 'r';
const char *fs = fs_src;
GLuint vert = GL.glCreateShader(eGL_VERTEX_SHADER);
GLuint frag = GL.glCreateShader(eGL_FRAGMENT_SHADER);
@@ -1833,7 +1846,7 @@ void APIENTRY _glGetTexImage(GLenum target, GLint level, GLenum format, GLenum t
// read from the blitted texture from level 0, as red
GL.glBindTexture(target, readtex);
level = 0;
format = eGL_RED;
format = remapformat;
RDCDEBUG("Done blit");
}