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vo_opengl: add manual sRGB companding to not artifact when dithering

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Patch by nand. Modified not to use macros in the GLSL, and also remove
the checks for framebuffer presence. (Disabling ICC if no sRGB
framebuffer is available was probably a bug.)
This commit is contained in:
nand 2012-11-10 19:08:21 +01:00 committed by wm4
parent c78243c03e
commit ed8fad729d
2 changed files with 11 additions and 14 deletions
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16
libvo/vo_opengl.c
View File

@ -698,6 +698,7 @@ static void compile_shaders(struct gl_priv *p)
shader_def_opt(&header_final, "USE_LINEAR_CONV_INV", p->use_lut_3d);
shader_def_opt(&header_final, "USE_GAMMA_POW", p->use_gamma);
shader_def_opt(&header_final, "USE_3DLUT", p->use_lut_3d);
shader_def_opt(&header_final, "USE_SRGB", p->use_srgb);
shader_def_opt(&header_final, "USE_DITHER", p->dither_texture != 0);
if (p->use_scale_sep && p->scalers[0].kernel) {
@ -1122,11 +1123,6 @@ static void do_render(struct gl_priv *p)
float final_texw = p->image_width * source->tex_w / (float)source->vp_w;
float final_texh = p->image_height * source->tex_h / (float)source->vp_h;
bool use_srgb_fb = p->use_srgb && !p->use_lut_3d;
if (use_srgb_fb)
gl->Enable(GL_FRAMEBUFFER_SRGB);
if (p->stereo_mode) {
int w = p->src_rect.x1 - p->src_rect.x0;
int imgw = p->image_width;
@ -1165,9 +1161,6 @@ static void do_render(struct gl_priv *p)
draw_triangles(p, vb, VERTICES_PER_QUAD);
}
if (use_srgb_fb)
gl->Disable(GL_FRAMEBUFFER_SRGB);
gl->UseProgram(0);
debug_check_gl(p, "after video rendering");
@ -1457,8 +1450,7 @@ static void check_gl_features(struct gl_priv *p)
GL *gl = p->gl;
bool have_float_tex = gl->mpgl_caps & MPGL_CAP_FLOAT_TEX;
bool have_fbo = gl->mpgl_caps & MPGL_CAP_FB;
bool have_srgb = (gl->mpgl_caps & MPGL_CAP_SRGB_TEX) &&
(gl->mpgl_caps & MPGL_CAP_SRGB_FB);
bool have_srgb = gl->mpgl_caps & MPGL_CAP_SRGB_TEX;
char *disabled[10];
int n_disabled = 0;
@ -1493,10 +1485,6 @@ static void check_gl_features(struct gl_priv *p)
p->use_lut_3d = false;
disabled[n_disabled++] = "color management (FBO)";
}
if (!have_srgb && p->use_lut_3d) {
p->use_lut_3d = false;
disabled[n_disabled++] = "color management (sRGB)";
}
if (!have_fbo) {
p->use_scale_sep = false;

9
libvo/vo_opengl_shaders.glsl
View File

@ -292,6 +292,12 @@ vec4 sample_sharpen5(sampler2D tex, vec2 texsize, vec2 texcoord) {
return p + t * filter_param1;
}
vec3 srgb_compand(vec3 v)
{
return mix(1.055 * pow(v, vec3(1.0/2.4)) - vec3(0.055), v * 12.92,
lessThanEqual(v, vec3(0.0031308)));
}
void main() {
#ifdef USE_PLANAR
vec3 color = vec3(SAMPLE_L(textures[0], textures_size[0], texcoord).r,
@ -325,6 +331,9 @@ void main() {
#ifdef USE_3DLUT
color = texture3D(lut_3d, color).rgb;
#endif
#ifdef USE_SRGB
color.rgb = srgb_compand(color.rgb);
#endif
#ifdef USE_DITHER
float dither_value = texture(dither, gl_FragCoord.xy / dither_size).r;
color = floor(color * dither_multiply + dither_value ) / dither_quantization;