Nickiel/zig-opengl
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working small rectangle

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Nickiel12 2024-10-07 19:17:05 -07:00
parent ab6f468ef7
commit 4f0ca1131f
1 changed files with 5 additions and 6 deletions
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11
src/main.zig
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@ -86,7 +86,9 @@ pub fn main() void {
var r_vert_buffer: c_uint = undefined;
gl.glad_glGenBuffers.?(1, &r_vert_buffer);
gl.glad_glBindBuffer.?(gl.GL_ARRAY_BUFFER, r_vert_buffer);
gl.glBufferData(gl.GL_ARRAY_BUFFER, 2 * 3 * @sizeOf(f32), @ptrCast(&rect_verts), gl.GL_STATIC_DRAW);
gl.glBufferData(gl.GL_ARRAY_BUFFER, 4 * 3 * @sizeOf(f32), @ptrCast(&rect_verts), gl.GL_STATIC_DRAW);
gl.glVertexAttribPointer(0, 3, gl.GL_FLOAT, gl.GL_FALSE, 3 * @sizeOf(f32), @ptrCast(&0));
gl.glEnableVertexAttribArray(0);
// gl.glad_glBindBuffer.?(0);
var element_buffer: c_uint = undefined;
@ -142,10 +144,9 @@ pub fn main() void {
gl.glClear(gl.GL_COLOR_BUFFER_BIT); // color buffer, depth buffer, and stencil buffer
gl.glUseProgram(shaderProgram);
gl.glad_glBindVertexArray.?(vao);
gl.glad_glBindBuffer.?(gl.GL_ARRAY_BUFFER, vbo);
// offset into vertexes, and count
// gl.glDrawArrays(gl.GL_TRIANGLES, 0, 3);
gl.glad_glBindVertexArray.?(vao);
gl.glDrawArrays(gl.GL_TRIANGLES, 0, 3);
gl_err = gl.glGetError();
@ -155,8 +156,6 @@ pub fn main() void {
}
gl.glad_glBindVertexArray.?(rect_vao);
gl.glad_glBindBuffer.?(gl.GL_ARRAY_BUFFER, r_vert_buffer);
gl.glad_glBindBuffer.?(gl.GL_ELEMENT_ARRAY_BUFFER, element_buffer);
gl.glDrawElements(gl.GL_TRIANGLES, 6, gl.GL_UNSIGNED_INT, null);
gl_err = gl.glGetError();