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draw a cube; rotate cube over time; enable cull face

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This commit is contained in:
Josh Holtrop 2015-10-13 23:03:45 -04:00
parent eb83cb256e
commit 45453d8ebc
1 changed files with 35 additions and 4 deletions
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37
app.cc
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@ -32,6 +32,7 @@ bool init(void)
{
glClearColor (0.0, 0.0, 0.0, 0.0);
glEnable(GL_DEPTH_TEST);
glEnable(GL_CULL_FACE);
#if 0
glEnable(GL_BLEND);
glBlendFunc(GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA);
@ -107,6 +108,19 @@ bool init(void)
static void draw_cube()
{
static const struct
{
int counts;
float axis[3];
} rotations[] = {
{0, {0, 0, 0}},
{1, {1, 0, 0}},
{2, {1, 0, 0}},
{3, {1, 0, 0}},
{1, {0, 1, 0}},
{3, {0, 1, 0}},
};
glm::mat4 modelview_backup = modelview;
program->use();
@ -116,16 +130,33 @@ static void draw_cube()
glUniform4f(uniforms.specular, 1.0, 1.0, 1.0, 1.0);
glUniform1f(uniforms.shininess, 150.0);
glUniform1i(uniforms.tex, 0);
glUniformMatrix4fv(uniforms.modelview, 1, GL_FALSE, &modelview[0][0]);
glUniformMatrix4fv(uniforms.projection, 1, GL_FALSE, &projection[0][0]);
for (int i = 0; i < sizeof(rotations) / sizeof(rotations[0]); i++)
{
if (rotations[i].counts > 0)
{
modelview = glm::rotate(modelview_backup,
(float)(M_PI / 2.0 * rotations[i].counts),
glm::vec3(rotations[i].axis[0],
rotations[i].axis[1],
rotations[i].axis[2]));
}
glUniformMatrix4fv(uniforms.modelview, 1, GL_FALSE, &modelview[0][0]);
glDrawArrays(GL_TRIANGLE_FAN, 0, 4);
}
modelview = modelview_backup;
}
void display(SDL_Window * window)
{
glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
modelview = glm::translate(glm::mat4(1.0), glm::vec3(0, 0, -5));
modelview = glm::rotate(modelview, (float)(SDL_GetTicks() / 1000.0), glm::vec3(0, 1, 0));
modelview = glm::lookAt(glm::vec3(-1, -8, 7),
glm::vec3(0, 0, 0),
glm::vec3(0, 0, 1));
modelview = glm::rotate(modelview, (float)(SDL_GetTicks() / 1000.0), glm::vec3(0, 0, 1));
modelview = glm::translate(modelview, glm::vec3(3, 0, 0));
draw_cube();