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add resolution uniform

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klemek
2025-09-11 00:41:28 +02:00
parent 4fb469a4f1
commit f1cd2b293c
2 changed files with 11 additions and 2 deletions
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README.md
+1 -1
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@@ -84,7 +84,7 @@ make -f Makefile.dev release-arch
- [ ] Basics - [ ] Basics
- [x] Create GLSL Window - [x] Create GLSL Window
- [x] Load static fragment shader into GLSL - [x] Load static fragment shader into GLSL
- [ ] Add default uniforms - [x] Add default uniforms
- [ ] Read fragment shader from file - [ ] Read fragment shader from file
- [ ] Minimal working fragment sample - [ ] Minimal working fragment sample
- [ ] Hot-reload fragment shader - [ ] Hot-reload fragment shader
src/forge.c
+10 -1
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@@ -33,11 +33,17 @@ static const char *vertex_shader_text =
static const char *fragment_shader_text = static const char *fragment_shader_text =
"#version 330\n" "#version 330\n"
"uniform float iTime;\n" "uniform float iTime;\n"
"uniform vec2 iResolution;\n"
"in vec2 vUV;\n" "in vec2 vUV;\n"
"out vec4 fragColor;\n" "out vec4 fragColor;\n"
"void main()\n" "void main()\n"
"{\n" "{\n"
" fragColor = vec4(vUV.x, vUV.y, abs(sin(iTime)), 1.0);\n" " vec2 uv0 = vUV.st;\n"
" float ratio = iResolution.x / iResolution.y;\n"
" vec2 uv1 = (uv0 - .5) * vec2(ratio, 1);\n"
" vec3 color = vec3(vUV, 0.0);\n"
" color *= 1 - step(abs(sin(iTime) * 0.5),length(uv1));\n"
" fragColor = vec4(color, 1.0);\n"
"}\n"; "}\n";
void error_callback(int error, const char *description) { void error_callback(int error, const char *description) {
@@ -100,6 +106,7 @@ void forge_run(parameters params) {
const GLint mvp_location = glGetUniformLocation(program, "mvp"); const GLint mvp_location = glGetUniformLocation(program, "mvp");
const GLint itime_location = glGetUniformLocation(program, "iTime"); const GLint itime_location = glGetUniformLocation(program, "iTime");
const GLint ires_location = glGetUniformLocation(program, "iResolution");
const GLint vpos_location = glGetAttribLocation(program, "vPos"); const GLint vpos_location = glGetAttribLocation(program, "vPos");
GLuint vertex_array; GLuint vertex_array;
@@ -113,6 +120,7 @@ void forge_run(parameters params) {
int width, height; int width, height;
glfwGetFramebufferSize(window, &width, &height); glfwGetFramebufferSize(window, &width, &height);
const float ratio = width / (float)height; const float ratio = width / (float)height;
vec2 resolution = {(float)width, (float)height};
glViewport(0, 0, width, height); glViewport(0, 0, width, height);
glClear(GL_COLOR_BUFFER_BIT); glClear(GL_COLOR_BUFFER_BIT);
@@ -125,6 +133,7 @@ void forge_run(parameters params) {
glUseProgram(program); glUseProgram(program);
glUniformMatrix4fv(mvp_location, 1, GL_FALSE, (const GLfloat *)&mvp); glUniformMatrix4fv(mvp_location, 1, GL_FALSE, (const GLfloat *)&mvp);
glUniform1f(itime_location, (const GLfloat)glfwGetTime()); glUniform1f(itime_location, (const GLfloat)glfwGetTime());
glUniform2fv(ires_location, 1, (const GLfloat *)&resolution);
glBindVertexArray(vertex_array); glBindVertexArray(vertex_array);
glDrawArrays(GL_TRIANGLES, 0, 6); glDrawArrays(GL_TRIANGLES, 0, 6);