opengl_x11

commit ddaa91f5b7a296c327964ab85854b49e3114065f
parent 72fdb4b86782b4b3d47328cc2905f7782a738a9c
Author: bsandro <email@bsandro.tech>
Date:   Thu, 16 Oct 2025 00:48:10 +0300

2 triangles and a square changing colors

Diffstat:
M
main1.c
 | 
26
+++++++++++++++-----------

1 file changed, 15 insertions(+), 11 deletions(-)
diff --git a/main1.c b/main1.c
@@ -46,9 +46,9 @@ uniform double iTime;                   \n\
 in vec3 color;                          \n\
 out vec4 outColor;                      \n\
 void main() {                           \n\
-    float c = abs(sin(float(iTime)));   \n\
-//    outColor = vec4(c, 0.5, 0.3, 1.0);  \n\
-    outColor = vec4(color, 1.0);        \n\
+    float c1 = abs(sin(float(iTime)));  \n\
+    float c2 = abs(cos(float(iTime)));  \n\
+    outColor = vec4(color+c1-c2, 1.0);  \n\
 }                                       \n\
 ";
 
@@ -119,17 +119,24 @@ int main(int argc, char *argv[]) {
     // [x, y, r, g, b]
     static const GLfloat vertices[] = {
           0.01f,  0.01f, 1.0f, 0.0f, 0.0f,
-          0.4f,   0.0f,  0.0f, 1.0f, 0.0f,
-          0.0f,   0.4f,  0.0f, 0.0f, 1.0f,
+          0.8f,   0.0f,  0.0f, 1.0f, 0.0f,
+          0.0f,   0.8f,  0.0f, 0.0f, 1.0f,
 
          -0.01f, -0.01f, 0.0f, 0.0f, 1.0f,
-         -0.4f,   0.0f,  0.0f, 1.0f, 0.0f,
-          0.0f,  -0.4f,  1.0f, 0.0f, 0.0f
+         -0.8f,   0.0f,  0.0f, 1.0f, 0.0f,
+          0.0f,  -0.8f,  1.0f, 0.0f, 0.0f,
+
+          0.3f,   0.3f,  1.0f, 0.0f, 0.0f,
+          0.3f,   0.6f,  1.0f, 0.0f, 0.0f,
+          0.6f,   0.3f,  1.0f, 0.0f, 0.0f,
+          0.6f,   0.6f,  1.0f, 0.0f, 0.0f
     };
 
     static const GLuint elements[] = {
         0, 1, 5,
-        3, 2, 4
+        3, 2, 4,
+        6, 7, 8,
+        7, 8, 9
     };
 
     GLuint vbo;
@@ -183,10 +190,7 @@ int main(int argc, char *argv[]) {
         GLint color = glGetAttribLocation(shaderPrg, "inColor");
         glEnableVertexAttribArray(color);
         glVertexAttribPointer(color, 3, GL_FLOAT, GL_FALSE, 5*sizeof(GLfloat), (void *)(2*sizeof(GLfloat)));
-        //glDrawArrays(GL_TRIANGLES, 0, sizeof(vertices)/sizeof(GLfloat)/5);
         glDrawElements(GL_TRIANGLES, sizeof(elements), GL_UNSIGNED_INT, 0);
-        //glDisableVertexAttribArray(0);
-        //glUseProgram(0);
 
         glXSwapBuffers(dpy, win);
         usleep(1000*16);