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Add vertex type and offsetof to OpenGL triangle
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@ -30,17 +30,20 @@
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#include "linmath.h"
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#include <stdlib.h>
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#include <stddef.h>
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#include <stdio.h>
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static const struct
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typedef struct Vertex
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{
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float x, y;
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float r, g, b;
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} vertices[3] =
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vec2 pos;
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vec3 col;
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} Vertex;
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static const Vertex vertices[3] =
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{
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{ -0.6f, -0.4f, 1.f, 0.f, 0.f },
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{ 0.6f, -0.4f, 0.f, 1.f, 0.f },
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{ 0.f, 0.6f, 0.f, 0.f, 1.f }
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{ { -0.6f, -0.4f }, { 1.f, 0.f, 0.f } },
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{ { 0.6f, -0.4f }, { 0.f, 1.f, 0.f } },
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{ { 0.f, 0.6f }, { 0.f, 0.f, 1.f } }
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};
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static const char* vertex_shader_text =
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@ -123,10 +126,10 @@ int main(void)
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glEnableVertexAttribArray(vpos_location);
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glVertexAttribPointer(vpos_location, 2, GL_FLOAT, GL_FALSE,
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sizeof(vertices[0]), (void*) 0);
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sizeof(Vertex), (void*) offsetof(Vertex, pos));
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glEnableVertexAttribArray(vcol_location);
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glVertexAttribPointer(vcol_location, 3, GL_FLOAT, GL_FALSE,
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sizeof(vertices[0]), (void*) (sizeof(float) * 2));
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sizeof(Vertex), (void*) offsetof(Vertex, col));
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while (!glfwWindowShouldClose(window))
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{
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