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Refactored gluPerspective-like function in GL1

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It was being called repeteadly with the same parameters, so it was
re-written with only one needed parameter, with the rest of the data
being obtained inside the function, to avoid logic duplication.
This commit is contained in:
Jaime Moreira 2024-12-11 20:46:53 -03:00
parent 6b8cd8fdf9
commit 6a3a081b4b
2 changed files with 19 additions and 22 deletions
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7
src/client/refresh/gl1/gl1_buffer.c
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@ -36,7 +36,7 @@ int cur_lm_copy; // which lightmap copy to use (when lightmapcopies=on)
static GLushort vtx_ptr, idx_ptr; // pointers for array positions in gl_buf
extern void R_MYgluPerspective(GLdouble fovy, GLdouble aspect, GLdouble zNear, GLdouble zFar);
extern void R_SetPerspective(GLdouble fovy);
void
R_ResetGLBuffer(void)
@ -50,7 +50,6 @@ R_ApplyGLBuffer(void)
// Properties of batched draws here
GLint vtx_size;
qboolean texture, mtex, alpha, color, alias, texenv_set;
float fovy, dist;
if (vtx_ptr == 0 || idx_ptr == 0)
{
@ -107,9 +106,7 @@ R_ApplyGLBuffer(void)
glScalef(-1, 1, 1);
}
fovy = (r_gunfov->value < 0) ? r_newrefdef.fov_y : r_gunfov->value;
dist = (r_farsee->value == 0) ? 4096.0f : 8192.0f;
R_MYgluPerspective(fovy, (float)r_newrefdef.width / r_newrefdef.height, 4, dist);
R_SetPerspective( (r_gunfov->value < 0) ? r_newrefdef.fov_y : r_gunfov->value );
glMatrixMode(GL_MODELVIEW);

34
src/client/refresh/gl1/gl1_main.c
View file

@ -727,19 +727,28 @@ R_SetupFrame(void)
}
void
R_MYgluPerspective(GLdouble fovy, GLdouble aspect,
GLdouble zNear, GLdouble zFar)
R_SetPerspective(GLdouble fovy)
{
// gluPerspective style parameters
static const GLdouble zNear = 4;
const GLdouble zFar = (r_farsee->value) ? 8192.0f : 4096.0f;
const GLdouble aspectratio = (GLdouble)r_newrefdef.width / r_newrefdef.height;
GLdouble xmin, xmax, ymin, ymax;
// traditional gluPerspective calculations - https://youtu.be/YqSNGcF5nvM?t=644
ymax = zNear * tan(fovy * M_PI / 360.0);
xmax = ymax * aspectratio;
ymin = -ymax;
xmin = -xmax;
xmin = ymin * aspect;
xmax = ymax * aspect;
xmin += - gl1_stereo_convergence->value * (2 * gl_state.camera_separation) / zNear;
xmax += - gl1_stereo_convergence->value * (2 * gl_state.camera_separation) / zNear;
if (gl_state.camera_separation)
{
const GLdouble separation = - gl1_stereo_convergence->value * (2 * gl_state.camera_separation) / zNear;
xmin += separation;
xmax += separation;
}
glFrustum(xmin, xmax, ymin, ymax, zNear, zFar);
}
@ -747,7 +756,6 @@ R_MYgluPerspective(GLdouble fovy, GLdouble aspect,
void
R_SetupGL(void)
{
float screenaspect;
int x, x2, y2, y, w, h;
/* set up viewport */
@ -777,18 +785,10 @@ R_SetupGL(void)
glViewport(x, y2, w, h);
/* set up projection matrix */
screenaspect = (float)r_newrefdef.width / r_newrefdef.height;
glMatrixMode(GL_PROJECTION);
glLoadIdentity();
if (r_farsee->value == 0)
{
R_MYgluPerspective(r_newrefdef.fov_y, screenaspect, 4, 4096);
}
else
{
R_MYgluPerspective(r_newrefdef.fov_y, screenaspect, 4, 8192);
}
R_SetPerspective(r_newrefdef.fov_y);
glCullFace(GL_FRONT);