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allow scaling and gamma correction independelty

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This commit is contained in:
Eric Wasylishen 2017-05-02 13:29:52 -06:00
parent c71d900e2d
commit 16921ee6db
1 changed files with 26 additions and 12 deletions
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38
quakespasm/Quake/gl_rmain.c
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@ -181,18 +181,23 @@ static void GLSLGamma_CreateShaders (void)
/*
=============
GLSLGamma_GammaCorrect
Performs:
- GLSL gamma correction (requires OpenGL 2.0)
- framebuffer scaling (vid_scaled) (any OpenGL version)
=============
*/
void GLSLGamma_GammaCorrect (void)
{
qboolean wants_gamma, wants_scaling;
float smax, tmax;
if (!gl_glsl_gamma_able)
wants_gamma = gl_glsl_gamma_able && (vid_gamma.value != 1 || vid_contrast.value != 1);
wants_scaling = (vid.unscaled_width != vid.width || vid.unscaled_height != vid.height);
if (!wants_gamma && !wants_scaling)
return;
if (vid_gamma.value == 1 && vid_contrast.value == 1)
return;
// create render-to-texture texture if needed
if (!r_gamma_texture)
{
@ -214,7 +219,7 @@ void GLSLGamma_GammaCorrect (void)
}
// create shader if needed
if (!r_gamma_program)
if (wants_gamma && !r_gamma_program)
{
GLSLGamma_CreateShaders ();
if (!r_gamma_program)
@ -229,15 +234,22 @@ void GLSLGamma_GammaCorrect (void)
glCopyTexSubImage2D (GL_TEXTURE_2D, 0, 0, 0, glx, gly, glwidth, glheight);
// draw the texture back to the framebuffer with a fragment shader
GL_UseProgramFunc (r_gamma_program);
GL_Uniform1fFunc (gammaLoc, vid_gamma.value);
GL_Uniform1fFunc (contrastLoc, q_min(2.0, q_max(1.0, vid_contrast.value)));
GL_Uniform1iFunc (textureLoc, 0); // use texture unit 0
if (wants_gamma)
{
GL_UseProgramFunc (r_gamma_program);
GL_Uniform1fFunc (gammaLoc, vid_gamma.value);
GL_Uniform1fFunc (contrastLoc, q_min(2.0, q_max(1.0, vid_contrast.value)));
GL_Uniform1iFunc (textureLoc, 0); // use texture unit 0
}
glDisable (GL_ALPHA_TEST);
glDisable (GL_DEPTH_TEST);
glViewport (0, 0, vid.unscaled_width, vid.unscaled_height);
glMatrixMode (GL_PROJECTION);
glLoadIdentity ();
glMatrixMode (GL_MODELVIEW);
glLoadIdentity ();
smax = glwidth/(float)r_gamma_texture_width;
tmax = glheight/(float)r_gamma_texture_height;
@ -253,9 +265,11 @@ void GLSLGamma_GammaCorrect (void)
glVertex2f (-1, 1);
glEnd ();
GL_UseProgramFunc (0);
// unbind program if we enabled it
if (wants_gamma)
GL_UseProgramFunc (0);
// clear cached binding
// clear cached texture binding
GL_ClearBindings ();
}