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Add vertex type and offsetof to OpenGL triangle

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This commit is contained in:
Camilla Löwy 2019-05-19 21:18:30 +02:00
parent f61d0916fd
commit d44bfe0264
1 changed files with 12 additions and 9 deletions
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21
examples/simple.c
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@ -30,17 +30,20 @@
#include "linmath.h" #include "linmath.h"
#include <stdlib.h> #include <stdlib.h>
#include <stddef.h>
#include <stdio.h> #include <stdio.h>
static const struct typedef struct Vertex
{ {
float x, y; vec2 pos;
float r, g, b; vec3 col;
} vertices[3] = } Vertex;
static const Vertex vertices[3] =
{ {
{ -0.6f, -0.4f, 1.f, 0.f, 0.f }, { { -0.6f, -0.4f }, { 1.f, 0.f, 0.f } },
{ 0.6f, -0.4f, 0.f, 1.f, 0.f }, { { 0.6f, -0.4f }, { 0.f, 1.f, 0.f } },
{ 0.f, 0.6f, 0.f, 0.f, 1.f } { { 0.f, 0.6f }, { 0.f, 0.f, 1.f } }
}; };
static const char* vertex_shader_text = static const char* vertex_shader_text =
@ -123,10 +126,10 @@ int main(void)
glEnableVertexAttribArray(vpos_location); glEnableVertexAttribArray(vpos_location);
glVertexAttribPointer(vpos_location, 2, GL_FLOAT, GL_FALSE, glVertexAttribPointer(vpos_location, 2, GL_FLOAT, GL_FALSE,
sizeof(vertices[0]), (void*) 0); sizeof(Vertex), (void*) offsetof(Vertex, pos));
glEnableVertexAttribArray(vcol_location); glEnableVertexAttribArray(vcol_location);
glVertexAttribPointer(vcol_location, 3, GL_FLOAT, GL_FALSE, glVertexAttribPointer(vcol_location, 3, GL_FLOAT, GL_FALSE,
sizeof(vertices[0]), (void*) (sizeof(float) * 2)); sizeof(Vertex), (void*) offsetof(Vertex, col));
while (!glfwWindowShouldClose(window)) while (!glfwWindowShouldClose(window))
{ {