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GL: rewritten the v210 shader to GLSL 1.1

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This commit is contained in:
Martin Pulec
2022-05-06 15:21:13 +02:00
parent 6aacbccdcf
commit 4db63a3431
1 changed files with 35 additions and 22 deletions
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57
src/video_display/gl.cpp
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@@ -124,13 +124,13 @@ void main()
)raw";
/// with courtesy of https://stackoverflow.com/questions/20317882/how-can-i-correctly-unpack-a-v210-video-frame-using-glsl
/// adapted to GLSL 1.1 with help of https://stackoverflow.com/questions/5879403/opengl-texture-coordinates-in-pixel-space/5879551#5879551
static const char * v210_to_rgb_fp = R"raw(
#version 130
#version 110
#extension GL_EXT_gpu_shader4 : enable
//in vec2 texcoord;
uniform mediump sampler2D tex;
uniform sampler2D image;
uniform float imageWidth;
out mediump vec4 color;
uniform float imageWidthOrig;
// YUV offset
const vec3 yuvOffset = vec3(-0.0625, -0.5, -0.5);
@@ -177,40 +177,51 @@ vec3 ycbcr2rgb(vec3 yuvToConvert) {
}
void main(void) {
ivec2 size = textureSize2D(tex, 0).xy; // 480x486
ivec2 sizeOrig = ivec2(imageWidth, size.y); // 720x486
// interpolate 0,0 -> 1,1 texcoords to 0,0 -> 720,486
ivec2 texcoordDenorm = ivec2(gl_TexCoord[0].xy * sizeOrig);
int texcoordDenormX;
texcoordDenormX = int((2. * gl_TexCoord[0].x * imageWidth - 1.) / 2.);
// 0 1 1 2 3 3 4 5 5 6 7 7 etc.
int yOffset = offset(_y(texcoordDenorm.x));
int sourceColumnIndexY = GROUP_FOR_INDEX(yOffset);
int yOffset;
yOffset = offset(_y(texcoordDenormX));
int sourceColumnIndexY;
sourceColumnIndexY = GROUP_FOR_INDEX(yOffset);
// 0 0 1 1 2 2 4 4 5 5 6 6 etc.
int uOffset = offset(_u(texcoordDenorm.x));
int sourceColumnIndexU = GROUP_FOR_INDEX(uOffset);
int uOffset;
uOffset = offset(_u(texcoordDenormX));
int sourceColumnIndexU;
sourceColumnIndexU = GROUP_FOR_INDEX(uOffset);
// 0 0 2 2 3 3 4 4 6 6 7 7 etc.
int vOffset = offset(_v(texcoordDenorm.x));
int sourceColumnIndexV = GROUP_FOR_INDEX(vOffset);
int vOffset;
vOffset = offset(_v(texcoordDenormX));
int sourceColumnIndexV;
sourceColumnIndexV = GROUP_FOR_INDEX(vOffset);
// 1 0 2 1 0 2 1 0 2 etc.
int compY = SUBINDEX_FOR_INDEX(yOffset);
int compY;
compY = SUBINDEX_FOR_INDEX(yOffset);
// 0 0 1 1 2 2 0 0 1 1 2 2 etc.
int compU = SUBINDEX_FOR_INDEX(uOffset);
int compU;
compU = SUBINDEX_FOR_INDEX(uOffset);
// 2 2 0 0 1 1 2 2 0 0 1 1 etc.
int compV = SUBINDEX_FOR_INDEX(vOffset);
int compV;
compV = SUBINDEX_FOR_INDEX(vOffset);
vec4 y;
vec4 u;
vec4 v;
y = texture2D(image, vec2(float(2 * sourceColumnIndexY + 1) / (2. * imageWidthOrig), gl_TexCoord[0].y));
u = texture2D(image, vec2(float(2 * sourceColumnIndexU + 1) / (2. * imageWidthOrig), gl_TexCoord[0].y));
v = texture2D(image, vec2(float(2 * sourceColumnIndexV + 1) / (2. * imageWidthOrig), gl_TexCoord[0].y));
vec4 y = texelFetch(tex, ivec2(sourceColumnIndexY, texcoordDenorm.y), 0);
vec4 u = texelFetch(tex, ivec2(sourceColumnIndexU, texcoordDenorm.y), 0);
vec4 v = texelFetch(tex, ivec2(sourceColumnIndexV, texcoordDenorm.y), 0);
vec3 outColor = ycbcr2rgb(vec3(y[compY], u[compU], v[compV]));
color = vec4(outColor, 1.0);
gl_FragColor = vec4(outColor, 1.0);
}
)raw";
@@ -833,9 +844,11 @@ static void gl_reconfigure_screen(struct state_gl *s, struct video_desc desc)
GL_RGBA, GL_UNSIGNED_SHORT,
NULL);
glUseProgram(s->PHandle_v210);
glUniform1i(glGetUniformLocation(s->PHandle_v210, "tex"), 2);
glUniform1i(glGetUniformLocation(s->PHandle_v210, "image"), 2);
glUniform1f(glGetUniformLocation(s->PHandle_v210, "imageWidth"),
(GLfloat) desc.width);
glUniform1f(glGetUniformLocation(s->PHandle_v210, "imageWidthOrig"),
(GLfloat) vc_get_linesize(desc.width, v210) / 4);
glUseProgram(0);
} else if (desc.color_spec == RGBA) {
glBindTexture(GL_TEXTURE_2D,s->texture_display);