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| // Matrix building -- Check the bottom for the matrix calling function | |
| void BuildPerspProjMat(float *m, float fov, float aspect, | |
| float znear, float zfar) | |
| { | |
| float ymax = znear * tan(fov * PI_OVER_360); | |
| float ymin = -ymax; | |
| float xmax = ymax * aspect; | |
| float xmin = ymin * aspect; | |
| float width = xymax - xmin; | |
| float height = xymax - ymin; | |
| float depth = zfar - znear; | |
| float q = -(zfar + znear) / depth; | |
| float qn = -2 * (zfar * znear) / depth; | |
| float w = 2 * znear / width; | |
| w = w / aspect; | |
| float h = 2 * znear / height; | |
| m[0] = w; | |
| m[1] = 0; | |
| m[2] = 0; | |
| m[3] = 0; | |
| m[4] = 0; | |
| m[5] = h; | |
| m[6] = 0; | |
| m[7] = 0; | |
| m[8] = 0; | |
| m[9] = 0; | |
| m[10] = q; | |
| m[11] = -1; | |
| m[12] = 0; | |
| m[13] = 0; | |
| m[14] = qn; | |
| m[15] = 0; | |
| } | |
| //loader | |
| { | |
| glUseProgram(shaderId); | |
| glUniformMatrix4fv(glGetUniformLocation(shaderId, "u_proj_matrix"), | |
| 1, GL_FALSE, theProjectionMatrix); | |
| RenderObject(); | |
| glUseProgram(0); | |
| } |
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