diff options
| -rw-r--r-- | progs/glsl/deriv.c | 15 |
1 files changed, 13 insertions, 2 deletions
diff --git a/progs/glsl/deriv.c b/progs/glsl/deriv.c index 30f2b75fef7..588246b71ac 100644 --- a/progs/glsl/deriv.c +++ b/progs/glsl/deriv.c @@ -27,11 +27,15 @@ static GLuint SphereList, RectList, CurList; static GLint win = 0; static GLboolean anim = GL_TRUE; static GLfloat xRot = 0.0f, yRot = 0.0f; +static GLint WinSize[2]; +static GLint WinSizeUniform = -1; static void Redisplay(void) { + glUniform2iv(WinSizeUniform, 1, WinSize); + glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT); glPushMatrix(); @@ -55,6 +59,8 @@ Idle(void) static void Reshape(int width, int height) { + WinSize[0] = width; + WinSize[1] = height; glViewport(0, 0, width, height); glMatrixMode(GL_PROJECTION); glLoadIdentity(); @@ -163,8 +169,10 @@ static void Init(void) { static const char *fragShaderText = + "uniform ivec2 WinSize; \n" "void main() {\n" - " gl_FragColor = abs(dFdy(gl_TexCoord[0])) * 50.0;\n" + " vec2 d = dFdy(gl_TexCoord[0].xy) * vec2(WinSize); \n" + " gl_FragColor = vec4(d.x, d.y, 0.0, 1.0);\n" " // gl_FragColor = gl_TexCoord[0];\n" "}\n"; static const char *vertShaderText = @@ -181,6 +189,7 @@ Init(void) program = LinkShaders(vertShader, fragShader); glUseProgram(program); + WinSizeUniform = glGetUniformLocation(program, "WinSize"); /*assert(glGetError() == 0);*/ @@ -220,8 +229,10 @@ ParseOptions(int argc, char *argv[]) int main(int argc, char *argv[]) { + WinSize[0] = WinSize[1] = 200; + glutInit(&argc, argv); - glutInitWindowSize(200, 200); + glutInitWindowSize(WinSize[0], WinSize[1]); glutInitDisplayMode(GLUT_RGB | GLUT_DOUBLE | GLUT_DEPTH); win = glutCreateWindow(argv[0]); glewInit(); |