gwendolyn/pretty-automata
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same as before but with the updates done in a compute shader

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Gwendolyn 2023-05-03 17:42:03 +02:00
parent b66d918af8
commit 091005f8b8
1 changed files with 43 additions and 23 deletions
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66
main.cpp
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@ -56,18 +56,30 @@ static const char *vertex_shader =
" coord.xy = vertexPosition_modelspace.xy;\n"
"}";
static const char *fragment_shader = "#version 460\n"
"out vec3 color;\n"
"in vec2 coord;\n"
"layout (std430, binding = 2) restrict readonly buffer shader_data\n"
"{\n"
" int c[];\n"
"};\n"
static const char *fragment_shader =
"#version 460\n"
"out vec3 color;\n"
"in vec2 coord;\n"
"layout (std430, binding = 2) restrict readonly buffer shader_data\n"
"{\n"
" int c[];\n"
"};\n"
"void main(){\n"
" int x = int(255. * (coord.x + 1.) / 2.);"
" color = vec3(c[x]/255., 0.5,0.5);\n"
"}";
"void main(){\n"
" int x = int(255. * (coord.x + 1.) / 2.);"
" color = vec3(c[x]/255., 0.5,0.5);\n"
"}";
static const char *compute_shader =
"#version 460\n"
"layout(local_size_x = 1, local_size_y = 1) in;\n"
"layout (std430, binding = 2) restrict buffer shader_data\n"
"{\n"
" int c[];\n"
"};\n"
"void main(){\n"
" c[gl_GlobalInvocationID.x] = (c[gl_GlobalInvocationID.x] + 1) % 256;\n"
"}\n";
int main() {
glewExperimental = true;
@ -117,6 +129,10 @@ int main() {
loadShader(fragment_shader, GL_FRAGMENT_SHADER),
});
GLuint computeProgramId = loadProgram({
loadShader(compute_shader, GL_COMPUTE_SHADER),
});
int c[256];
for (size_t i = 0; i < 256; ++i) {
@ -126,31 +142,35 @@ int main() {
GLuint ssbo = 0;
glGenBuffers(1, &ssbo);
glBindBuffer(GL_SHADER_STORAGE_BUFFER, ssbo);
glBufferData(GL_SHADER_STORAGE_BUFFER, sizeof(int)*256, &c,GL_DYNAMIC_COPY);
glBufferData(GL_SHADER_STORAGE_BUFFER, sizeof(int) * 256, &c,
GL_DYNAMIC_COPY);
glBindBuffer(GL_SHADER_STORAGE_BUFFER, 0);
unsigned int block_index = glGetProgramResourceIndex(programId, GL_SHADER_STORAGE_BLOCK, "shader_data");
unsigned int block_index = glGetProgramResourceIndex(
programId, GL_SHADER_STORAGE_BLOCK, "shader_data");
GLuint ssbo_binding_point_index = 2;
glBindBufferBase(GL_SHADER_STORAGE_BUFFER, ssbo_binding_point_index, ssbo);
glShaderStorageBlockBinding(programId, block_index, ssbo_binding_point_index);
glUseProgram(computeProgramId);
glBindBufferBase(GL_SHADER_STORAGE_BUFFER, ssbo_binding_point_index, ssbo);
unsigned int compute_block_index = glGetProgramResourceIndex(
programId, GL_SHADER_STORAGE_BLOCK, "shader_data");
glShaderStorageBlockBinding(computeProgramId, compute_block_index,
ssbo_binding_point_index);
do {
glClear(GL_COLOR_BUFFER_BIT);
glUseProgram(computeProgramId);
glDispatchCompute(255, 1, 1);
glUseProgram(programId);
for (int & i : c) {
i = (i + 1) % 256;
}
glBindBuffer(GL_SHADER_STORAGE_BUFFER, ssbo);
GLvoid *p = glMapBuffer(GL_SHADER_STORAGE_BUFFER, GL_WRITE_ONLY);
std::memcpy(p, &c, sizeof(int) * 256);
glUnmapBuffer(GL_SHADER_STORAGE_BUFFER);
glEnableVertexAttribArray(0);
glBindBuffer(GL_ARRAY_BUFFER, vertexbuffer);
glVertexAttribPointer(0, 3, GL_FLOAT, GL_FALSE, 0, nullptr);
glDrawArrays(GL_TRIANGLES, 0,3);
glDrawArrays(GL_TRIANGLES, 0, 3);
glDisableVertexAttribArray(0);
glfwSwapBuffers(window);