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matabstrix
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Replace triangle with cube

This commit is contained in:
Meoweg 2015-11-04 19:39:44 +00:00
parent 7b6ab890be
commit 99119d7b6d
1 changed files with 65 additions and 12 deletions
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77
main.cpp
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@ -47,13 +47,55 @@ static const char fragment_shader_source[] = \
" gl_FragColor = f_color; \n"\
"} \n";
static const GLfloat triangle_vertices[] = {
0.0, 0.0, 0.8, 1.0, 0.0, 0.0,
-0.3, 0.0, 0.0, 0.0, 1.0, 0.0,
0.3, 0.0, 0.0, 0.0, 0.0, 1.0,
static GLfloat cube_vertices[] = {
// front
-1.0, -1.0, 1.0,
1.0, -1.0, 1.0,
1.0, 1.0, 1.0,
-1.0, 1.0, 1.0,
// back
-1.0, -1.0, -1.0,
1.0, -1.0, -1.0,
1.0, 1.0, -1.0,
-1.0, 1.0, -1.0,
};
static GLuint triangle;
const GLfloat cube_colors[] = {
// front colors
1.0, 0.0, 0.0,
0.0, 1.0, 0.0,
0.0, 0.0, 1.0,
1.0, 1.0, 1.0,
// back colors
1.0, 0.0, 0.0,
0.0, 1.0, 0.0,
0.0, 0.0, 1.0,
1.0, 1.0, 1.0,
};
const GLushort cube_elements[] = {
// front
0, 1, 2,
2, 3, 0,
// top
3, 2, 6,
6, 7, 3,
// back
7, 6, 5,
5, 4, 7,
// bottom
4, 5, 1,
1, 0, 4,
// left
4, 0, 3,
3, 7, 4,
// right
1, 5, 6,
6, 2, 1,
};
static GLuint cube_vertices_id, cube_colors_id;
static GLuint cube_elements_id;
int main()
{
@ -88,16 +130,26 @@ int main()
view_matrix = glGetUniformLocation(program, "view_matrix");
glGenBuffers(1, &triangle);
glBindBuffer(GL_ARRAY_BUFFER, triangle);
glBufferData(GL_ARRAY_BUFFER, 3 * 6 * sizeof(GLfloat), triangle_vertices, GL_STATIC_DRAW);
glVertexAttribPointer(0, 3, GL_FLOAT, GL_FALSE, 6 * sizeof(GLfloat), reinterpret_cast<const GLvoid*>(0));
glVertexAttribPointer(1, 3, GL_FLOAT, GL_FALSE, 6 * sizeof(GLfloat), reinterpret_cast<const GLvoid*>(3 * sizeof(GLfloat)));
glGenBuffers(1, &cube_vertices_id);
glBindBuffer(GL_ARRAY_BUFFER, cube_vertices_id);
glBufferData(GL_ARRAY_BUFFER, sizeof(cube_vertices), cube_vertices, GL_STATIC_DRAW);
glVertexAttribPointer(0, 3, GL_FLOAT, GL_FALSE, 0, reinterpret_cast<const GLvoid*>(0));
glEnableVertexAttribArray(0);
glGenBuffers(1, &cube_colors_id);
glBindBuffer(GL_ARRAY_BUFFER, cube_colors_id);
glBufferData(GL_ARRAY_BUFFER, sizeof(cube_colors), cube_colors, GL_STATIC_DRAW);
glVertexAttribPointer(1, 3, GL_FLOAT, GL_FALSE, 0, reinterpret_cast<const GLvoid*>(0));
glEnableVertexAttribArray(1);
glGenBuffers(1, &cube_elements_id);
glBindBuffer(GL_ELEMENT_ARRAY_BUFFER, cube_elements_id);
glBufferData(GL_ELEMENT_ARRAY_BUFFER, sizeof(cube_elements), cube_elements, GL_STATIC_DRAW);
glViewport(0, 0, 640, 480);
glEnable(GL_DEPTH_TEST);
glClearColor(0, 0, 0, 0);
emscripten_set_main_loop(iterate, 0, 1);
@ -113,7 +165,7 @@ GLuint load_shader(const GLenum type, const char *source)
void iterate()
{
glClear(GL_COLOR_BUFFER_BIT);
glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
glm::mat4 view = glm::mat4(1.0f)
* glm::rotate(glm::mat4(1.0f), glm::radians(delta_x - 90), glm::vec3(1.0f, 0.0f, 0.0f))
@ -121,7 +173,8 @@ void iterate()
glUniformMatrix4fv(view_matrix, 1, GL_FALSE, glm::value_ptr(view));
glDrawArrays(GL_TRIANGLES, 0, 3);
glBindBuffer(GL_ELEMENT_ARRAY_BUFFER, cube_elements_id);
glDrawElements(GL_TRIANGLES, 6 * 2 * 3, GL_UNSIGNED_SHORT, 0);
glfwPollEvents();
}