fries/dreamcast-opengl
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Set gl ortho.

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This commit is contained in:
Fries 2024-03-12 22:27:33 -07:00
parent e98856a874
commit f919b166df
1 changed files with 16 additions and 6 deletions
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22
gl.cc
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@ -31,10 +31,20 @@ void pressButton(cont_state_t* controller_state, int button, T&& callback) {
void initScreen() {
glClearColor(0.0f, 0.0f, 0.0f, 0.0f);
glViewport(0, 0, 640, 480);
glMatrixMode(GL_MODELVIEW);
glLoadIdentity();
glOrtho(0, 640, 0, 480, -100, 100);
glMatrixMode(GL_PROJECTION);
glLoadIdentity();
glOrtho(0.0, 1.0, 0.0, 1.0, -1.0, 1.0);
}
void glVertex3fNormalized(float x, float y, float z) {
int xSize, ySize;
xSize = 640;
ySize = 480;
glVertex3f(x * xSize, y * ySize, z);
}
void displayStuff() {
@ -46,16 +56,16 @@ void displayStuff() {
glColor3f(0.5f, 0.0f, 1.0f);
glBegin(GL_POLYGON);
glColor3f(1.0f, 0.0f, 0.0f);
glVertex3f(0.25f, 0.25f, 0.0f);
glVertex3fNormalized(0.25f, 0.25f, 0.0f);
glColor3f(0.0f, 1.0f, 0.0f);
glVertex3f(0.75f, 0.25f, 0.0f);
glVertex3fNormalized(0.75f, 0.25f, 0.0f);
glColor3f(0.0f, 0.0f, 1.0f);
glVertex3f(0.75f, 0.75f, 0.0f);
glVertex3fNormalized(0.75f, 0.75f, 0.0f);
glColor3f(1.0f, 1.0f, 1.0f);
glVertex3f(0.25f, 0.75f, 0.0f);
glVertex3fNormalized(0.25f, 0.75f, 0.0f);
glEnd();
glPopMatrix();
// clang-format on