commit 6c799e60a3675f4fd9f90311e2bdfb2d57f972c0
parent 3dfc6cfdb943fa00282d18931040e3b6dc016395
Author: bsandro <email@bsandro.tech>
Date: Thu, 20 Nov 2025 22:45:32 +0200
rotating weird cube
Diffstat:
| M | cube.c | | | 66 | +++++++++++++++++++++++++++++++++++++++++++++++------------------- |
1 file changed, 47 insertions(+), 19 deletions(-)
diff --git a/cube.c b/cube.c
@@ -37,14 +37,14 @@ static double t_started;
//@todo maybe move shaders to separate files
static const GLchar *vertexSrc = R"(
#version 420
-layout(location=0) in vec2 position;
+layout(location=0) in vec3 position;
layout(location=1) in vec2 aTexCoord;
out vec2 texCoord;
uniform mat4 model;
uniform mat4 view;
uniform mat4 projection;
void main() {
- gl_Position = projection * view * model * vec4(position, 0.0, 1.0);
+ gl_Position = projection * view * model * vec4(position, 1.0);
texCoord = aTexCoord;
}
)";
@@ -181,14 +181,47 @@ int main(int argc, char *argv[]) {
// x,y,tx,ty
static const GLfloat vertices[] = {
- -0.5, -0.5, 0+c, 1-c,
- 0.5, -0.5, 1-c, 1-c,
- 0.5, 0.5, 1-c, 0+c,
- -0.5, 0.5, 0+c, 0+c
- };
- static const GLuint elements[] = {
- 0, 1, 2,
- 2, 3, 0
+ -0.5f, -0.5f, -0.5f, 0.0f, 0.0f,
+ 0.5f, -0.5f, -0.5f, 1.0f, 0.0f,
+ 0.5f, 0.5f, -0.5f, 1.0f, 1.0f,
+ 0.5f, 0.5f, -0.5f, 1.0f, 1.0f,
+ -0.5f, 0.5f, -0.5f, 0.0f, 1.0f,
+ -0.5f, -0.5f, -0.5f, 0.0f, 0.0f,
+
+ -0.5f, -0.5f, 0.5f, 0.0f, 0.0f,
+ 0.5f, -0.5f, 0.5f, 1.0f, 0.0f,
+ 0.5f, 0.5f, 0.5f, 1.0f, 1.0f,
+ 0.5f, 0.5f, 0.5f, 1.0f, 1.0f,
+ -0.5f, 0.5f, 0.5f, 0.0f, 1.0f,
+ -0.5f, -0.5f, 0.5f, 0.0f, 0.0f,
+
+ -0.5f, 0.5f, 0.5f, 1.0f, 0.0f,
+ -0.5f, 0.5f, -0.5f, 1.0f, 1.0f,
+ -0.5f, -0.5f, -0.5f, 0.0f, 1.0f,
+ -0.5f, -0.5f, -0.5f, 0.0f, 1.0f,
+ -0.5f, -0.5f, 0.5f, 0.0f, 0.0f,
+ -0.5f, 0.5f, 0.5f, 1.0f, 0.0f,
+
+ 0.5f, 0.5f, 0.5f, 1.0f, 0.0f,
+ 0.5f, 0.5f, -0.5f, 1.0f, 1.0f,
+ 0.5f, -0.5f, -0.5f, 0.0f, 1.0f,
+ 0.5f, -0.5f, -0.5f, 0.0f, 1.0f,
+ 0.5f, -0.5f, 0.5f, 0.0f, 0.0f,
+ 0.5f, 0.5f, 0.5f, 1.0f, 0.0f,
+
+ -0.5f, -0.5f, -0.5f, 0.0f, 1.0f,
+ 0.5f, -0.5f, -0.5f, 1.0f, 1.0f,
+ 0.5f, -0.5f, 0.5f, 1.0f, 0.0f,
+ 0.5f, -0.5f, 0.5f, 1.0f, 0.0f,
+ -0.5f, -0.5f, 0.5f, 0.0f, 0.0f,
+ -0.5f, -0.5f, -0.5f, 0.0f, 1.0f,
+
+ -0.5f, 0.5f, -0.5f, 0.0f, 1.0f,
+ 0.5f, 0.5f, -0.5f, 1.0f, 1.0f,
+ 0.5f, 0.5f, 0.5f, 1.0f, 0.0f,
+ 0.5f, 0.5f, 0.5f, 1.0f, 0.0f,
+ -0.5f, 0.5f, 0.5f, 0.0f, 0.0f,
+ -0.5f, 0.5f, -0.5f, 0.0f, 1.0f
};
GLuint vbo;
@@ -196,11 +229,6 @@ int main(int argc, char *argv[]) {
glBindBuffer(GL_ARRAY_BUFFER, vbo);
glBufferData(GL_ARRAY_BUFFER, sizeof(vertices), vertices, GL_STATIC_DRAW);
- GLuint ebo;
- glGenBuffers(1, &ebo);
- glBindBuffer(GL_ELEMENT_ARRAY_BUFFER, ebo);
- glBufferData(GL_ELEMENT_ARRAY_BUFFER, sizeof(elements), elements, GL_STATIC_DRAW);
-
GLuint vertex = mkShader(GL_VERTEX_SHADER, vertexSrc);
GLuint fragment = mkShader(GL_FRAGMENT_SHADER, fragmentSrc);
GLuint shaderPrg = linkProgram(vertex, fragment);
@@ -212,10 +240,10 @@ int main(int argc, char *argv[]) {
// texture
GLuint tex = mkTextureAstc(tex_fname);
GLint position = glGetAttribLocation(shaderPrg, "position");
- glVertexAttribPointer(position, 2, GL_FLOAT, GL_FALSE, 4*sizeof(GLfloat), (void *)0);
+ glVertexAttribPointer(position, 3, GL_FLOAT, GL_FALSE, 5*sizeof(GLfloat), (void *)0);
glEnableVertexAttribArray(position);
GLint aTexCoord = glGetAttribLocation(shaderPrg, "aTexCoord");
- glVertexAttribPointer(aTexCoord, 2, GL_FLOAT, GL_FALSE, 4*sizeof(GLfloat), (void *)(2*sizeof(GLfloat)));
+ glVertexAttribPointer(aTexCoord, 2, GL_FLOAT, GL_FALSE, 5*sizeof(GLfloat), (void *)(3*sizeof(GLfloat)));
glEnableVertexAttribArray(aTexCoord);
mat4 model;
@@ -260,7 +288,7 @@ int main(int argc, char *argv[]) {
glUniform1d(iTime, current_ts()-t_started);
//printf("%f\n", fabsf(sinf(current_ts()-t_started)));
- //glm_rotate(view, glm_rad(rotation), (vec3){0.0, 0.0, 1.0});
+ glm_rotate(model, glm_rad(1.f), (vec3){0.5f, 1.f, 0.f});
GLuint loc_model = glGetUniformLocation(shaderPrg, "model");
glUniformMatrix4fv(loc_model, 1, GL_FALSE, model[0]);
GLuint loc_view = glGetUniformLocation(shaderPrg, "view");
@@ -272,7 +300,7 @@ int main(int argc, char *argv[]) {
glUniform1i(tex, 0);
glActiveTexture(GL_TEXTURE0);
glBindTexture(GL_TEXTURE_2D, tex);
- glDrawElements(GL_TRIANGLES, sizeof(elements)/sizeof(elements[0]), GL_UNSIGNED_INT, 0);
+ glDrawArrays(GL_TRIANGLES, 0, sizeof(vertices)/sizeof(vertices[0]));
glXSwapBuffers(dpy, win);
usleep(1000*7); // 144hz
