diff options
Diffstat (limited to 'balls.c')
| -rw-r--r-- | balls.c | 61 |
1 files changed, 35 insertions, 26 deletions
@@ -17,7 +17,7 @@ #define FRAGMENT_SHADER "balls.frag" enum { WIDTH = 640, HEIGHT = 480 }; -enum { NVERTICES = 256 }; +enum { NBALLS = 1, CIRCLE_SEGS = 16 }; void initGL(int argc, char *argv[]); void initCL(void); @@ -35,9 +35,8 @@ static cl_context context; cl_program prog; static cl_command_queue queue; static cl_kernel kernel; -GLuint vao, vbo; -cl_mem vertexBuf; -float tick; +GLuint positionVAO, positionVBO, vertexVAO, vertexVBO; +cl_mem positionBuf, vertexBuf; int main(int argc, char *argv[]) { @@ -147,27 +146,40 @@ void configureSharedData(void) { int err; - /* Create vertex array object. */ - glGenVertexArrays(1, &vao); - glBindVertexArray(vao); + /* Create vertex array objects. */ + glGenVertexArrays(1, &positionVAO); + glBindVertexArray(positionVAO); - /* Create vertex buffer. */ - glGenBuffers(1, &vbo); + glGenVertexArrays(1, &vertexVAO); + glBindVertexArray(vertexVAO); + + /* Create vertex buffers. */ + glGenBuffers(1, &positionVBO); + glGenBuffers(1, &vertexVBO); /* Create VBO coordinates. */ - glBindBuffer(GL_ARRAY_BUFFER, vbo); - glBufferData(GL_ARRAY_BUFFER, 4 * NVERTICES * sizeof(GLfloat), NULL, GL_DYNAMIC_DRAW); - glVertexAttribPointer(0, 4, GL_FLOAT, GL_FALSE, 0, 0); + glBindBuffer(GL_ARRAY_BUFFER, positionVBO); + glBufferData(GL_ARRAY_BUFFER, 2 * NBALLS * sizeof(GLfloat), NULL, GL_DYNAMIC_DRAW); + glVertexAttribPointer(0, 2, GL_FLOAT, GL_FALSE, 0, 0); + glEnableVertexAttribArray(0); + + glBindBuffer(GL_ARRAY_BUFFER, vertexVBO); + glBufferData(GL_ARRAY_BUFFER, 2 * (CIRCLE_SEGS+2) * sizeof(GLfloat), NULL, GL_DYNAMIC_DRAW); + glVertexAttribPointer(0, 2, GL_FLOAT, GL_FALSE, 0, 0); glEnableVertexAttribArray(0); /* Create memory objects from VBOs. */ - vertexBuf = clCreateFromGLBuffer(context, CL_MEM_WRITE_ONLY, vbo, &err); + positionBuf = clCreateFromGLBuffer(context, CL_MEM_WRITE_ONLY, positionVBO, &err); + if (err < 0) + sysfatal("Failed to create buffer object from VBO.\n"); + + vertexBuf = clCreateFromGLBuffer(context, CL_MEM_WRITE_ONLY, vertexVBO, &err); if (err < 0) sysfatal("Failed to create buffer object from VBO.\n"); /* Set kernel arguments. */ - err = clSetKernelArg(kernel, 0, sizeof(cl_mem), &vertexBuf); - err |= clSetKernelArg(kernel, 1, sizeof(float), &tick); + err = clSetKernelArg(kernel, 0, sizeof(cl_mem), &positionBuf); + err |= clSetKernelArg(kernel, 1, sizeof(cl_mem), &vertexBuf); if (err < 0) sysfatal("Failed to set kernel arguments.\n"); } @@ -184,11 +196,7 @@ execKernel(void) { if (err < 0) sysfatal("Couldn't acquire the GL objects.\n"); - err = clSetKernelArg(kernel, 1, sizeof(float), &tick); - if (err < 0) - sysfatal("Failed to set kernel argument.\n"); - - globalSize = NVERTICES; + globalSize = CIRCLE_SEGS+1; err = clEnqueueNDRangeKernel(queue, kernel, 1, NULL, &globalSize, NULL, 0, NULL, &kernelEvent); if (err < 0) sysfatal("Couldn't enqueue kernel.\n"); @@ -204,6 +212,7 @@ execKernel(void) { void freeCL(void) { + clReleaseMemObject(positionBuf); clReleaseMemObject(vertexBuf); clReleaseKernel(kernel); clReleaseCommandQueue(queue); @@ -213,8 +222,10 @@ freeCL(void) { void freeGL(void) { - glDeleteBuffers(1, &vbo); - glDeleteBuffers(1, &vao); + glDeleteBuffers(1, &positionVBO); + glDeleteBuffers(1, &positionVAO); + glDeleteBuffers(1, &vertexVBO); + glDeleteBuffers(1, &vertexVAO); } void @@ -293,10 +304,8 @@ display(void) { execKernel(); - glBindVertexArray(vao); - glDrawArrays(GL_LINE_LOOP, 0, NVERTICES); - - tick += 0.0005f; + glBindVertexArray(vertexVAO); + glDrawArrays(GL_TRIANGLE_FAN, 0, CIRCLE_SEGS+2); glBindVertexArray(0); glutSwapBuffers(); |