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我試圖用GLSL着色器將12位YUV幀(YUV420P)轉換爲24位RGB幀。 在Nvidia視頻卡上它工作正常,但在ATI視頻卡上它也在工作,但工作不正確。圖像不能正確繪製。顏色是不同的,圖像是全尺寸的四分之一。不同顯卡上的GLSL片段着色器
這裏是着色器的代碼:
uniform sampler2DRect y_texture, u_texture, v_texture;
uniform float imageHeight;
void main(void) {
float sx, sy, r, g, b, y, u, v;
sx = gl_TexCoord[0].x;
sy = imageHeight - gl_TexCoord[0].y;
y = texture2DRect(y_texture, vec2(sx/2.0, sy/2.0)).r;
u = texture2DRect(u_texture, vec2(sx/2.0, sy/2.0)).r;
v = texture2DRect(v_texture, vec2(sx/2.0, sy/2.0)).r;
y = 1.1643 * (y - 0.0625);
u = u - 0.5;
v = v - 0.5;
r = y + 1.5958 * v;
g = y - 0.39173 * u - 0.8129 * v;
b = y + 2.017 * u;
gl_FragColor = vec4(r, g, b, 1.0);
}
我怎樣才能修改(或創建新的)?
下面是示例代碼:
glEnable(GL_TEXTURE_RECTANGLE_ARB);
//FrameHeight
int i_imageHeight = glGetUniformLocation(handleProgram, "imageHeight");
glUniform1f(i_imageHeight, (float)frameHeight);
//U
glActiveTexture(GL_TEXTURE1);
int i_u = glGetUniformLocationARB(handleProgram, "u_texture");
glUniform1iARB(i_u, 1);
glBindTexture(GL_TEXTURE_RECTANGLE_ARB, 1);
glTexParameteri(GL_TEXTURE_RECTANGLE_ARB, GL_TEXTURE_MAG_FILTER, GL_LINEAR);
glTexParameteri(GL_TEXTURE_RECTANGLE_ARB, GL_TEXTURE_MIN_FILTER, GL_LINEAR);
glTexEnvf(GL_TEXTURE_ENV, GL_TEXTURE_ENV_MODE, GL_DECAL);
glTexImage2D(GL_TEXTURE_RECTANGLE_ARB, 0, GL_LUMINANCE, frameWidth/2, frameHeight/2, 0, GL_LUMINANCE, GL_UNSIGNED_BYTE, uFrameData);
//V
glActiveTexture(GL_TEXTURE2);
int i_v = glGetUniformLocationARB(handleProgram, "v_texture");
glBindTexture(GL_TEXTURE_RECTANGLE_ARB, 2);
glUniform1iARB(i_v, 2);
glTexParameteri(GL_TEXTURE_RECTANGLE_ARB, GL_TEXTURE_MAG_FILTER,GL_LINEAR);
glTexParameteri(GL_TEXTURE_RECTANGLE_ARB, GL_TEXTURE_MIN_FILTER,GL_LINEAR);
glTexEnvf(GL_TEXTURE_ENV, GL_TEXTURE_ENV_MODE, GL_DECAL);
glTexImage2D(GL_TEXTURE_RECTANGLE_ARB, 0, GL_LUMINANCE, frameWidth/2, frameHeight/2, 0, GL_LUMINANCE, GL_UNSIGNED_BYTE, vFrameData);
//Y
glActiveTexture(GL_TEXTURE0);
int i_y = glGetUniformLocationARB(handleProgram, "y_texture");
glUniform1iARB(i_y, 3);
glBindTexture(GL_TEXTURE_RECTANGLE_ARB, 0);
glTexParameteri(GL_TEXTURE_RECTANGLE_ARB, GL_TEXTURE_MAG_FILTER, GL_LINEAR);
glTexParameteri(GL_TEXTURE_RECTANGLE_ARB, GL_TEXTURE_MIN_FILTER, GL_LINEAR);
glTexEnvf(GL_TEXTURE_ENV, GL_TEXTURE_ENV_MODE, GL_DECAL);
glTexImage2D(GL_TEXTURE_RECTANGLE_ARB, 0, GL_LUMINANCE, frameWidth, frameHeight, 0, GL_LUMINANCE, GL_UNSIGNED_BYTE, yFrameData);
//Draw
glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
glBegin(GL_QUADS);
glTexCoord2i(0, 0); glVertex2i(0, 0);
glTexCoord2i(frameWidth, 0); glVertex2i(this->width, 0);
glTexCoord2i(frameWidth, frameHeight); glVertex2i(this->width, this->height);
glTexCoord2i(0, frameHeight); glVertex2i(0, this->height);
glEnd();
glFlush();
SwapBuffers(hDC);
定義「不正確」。 – Bart 2012-03-26 09:44:07
請同時發佈主機代碼。也許你在那裏使用GL_TEXTURE_2D而不是GL_TEXTURE_RECTANGLE_ARB? – sschuberth 2012-03-26 10:25:53
我已經發布了代碼...同樣在着色器中: y = texture2DRect(y_texture,vec2(sx/2.0,sy/2.0))。r; 此行適用於ATI顯卡。在nVidia卡中: y = texture2DRect(y_texture,vec2(sx,sy))。r; – Alexander 2012-03-26 12:13:57