gl_vertex_indexing_with_texture.cpp

void DoDisplay()
{
	float jump = 0.25f;

	Vec3f vertex;
	vector<GLubyte> indices;
	Vec3f texture;

#ifdef AUTO_CALC
	for (GLfloat y = size; y >= -size; y -= jump){
		for (GLfloat x = -size; x <= size; x += jump){
			vertex.push(x, y);

			GLfloat i = (x + 1.0) / 2;
			GLfloat j = (y + 1.0) / 2;
			texture.push(i, j);
		}
	}

	int w = 2.0 * size / jump + 1;
	int n = w - 1;

	int h = w;
	int m = h - 1;

	for (int j = 0; j < m; j++){
		for (int i = 0; i < n; i++){
			int index = w * j + i;

			indices.push_back(index);
			indices.push_back(index + w);
			indices.push_back(index + 1);

			indices.push_back(index + w);
			indices.push_back(index + 1);
			indices.push_back(index + w + 1);

		}
	}
#else
	vertex.push_back(-1); vertex.push_back(1);
	vertex.push_back(-1); vertex.push_back(-1);
	vertex.push_back(1); vertex.push_back(1);
	vertex.push_back(1); vertex.push_back(-1);

	texture.push_back(0); texture.push_back(1);
	texture.push_back(0); texture.push_back(0);
	texture.push_back(1); texture.push_back(1);
	texture.push_back(1); texture.push_back(0);
#endif // AUTO_CALC

	load_texture();

	// 텍스처 환경 설정
	glTexEnvi(GL_TEXTURE_ENV, GL_TEXTURE_ENV_MODE, EnvMode);

	// 텍스처 필터 설정
	//glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, TexFilter);
	//glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, TexFilter);

	glClear(GL_COLOR_BUFFER_BIT);

	glPushMatrix();
	glPolygonMode(GL_FRONT_AND_BACK, GL_LINE);

	/*
	glMatrixMode(GL_TEXTURE);
	glLoadIdentity();
	glScalef(1.0f, -1.0f, 1.0f);
	*/
	glMatrixMode(GL_MODELVIEW);

	glRotatef(xAngle, 1.0f, 0.0f, 0.0f);
	glRotatef(yAngle, 0.0f, 1.0f, 0.0f);
	glRotatef(zAngle, 0.0f, 0.0f, 1.0f);

	glEnable(GL_TEXTURE_2D);

	glEnableClientState(GL_VERTEX_ARRAY);
	glEnableClientState(GL_TEXTURE_COORD_ARRAY);

	glVertexPointer(VERTEX_NUM, GL_FLOAT, 0, &vertex[0]);
	glTexCoordPointer(VERTEX_NUM, GL_FLOAT, 0, &texture[0]);

	glBindTexture(GL_TEXTURE_2D, g_texid);

#ifdef AUTO_CALC
	glDrawElements(GL_TRIANGLES, indices.size(), GL_UNSIGNED_BYTE, &indices[0]);
#else
	glDrawArrays(GL_TRIANGLE_STRIP, 0, vertex.size() / VERTEX_NUM);
#endif // AUTO_CALC

	//glDisable(GL_TEXTURE_2D);

	glPopMatrix();
	glFlush();
}