Mercurial > repos > blastem
diff render_sdl.c @ 500:251fe7a75a14
Preserve aspect ratio unless config file says otherwise
author | Mike Pavone <pavone@retrodev.com> |
---|---|
date | Tue, 29 Oct 2013 19:09:19 -0700 |
parents | 51bf87f76d15 |
children | 7fdfcced65b6 |
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--- a/render_sdl.c Tue Oct 29 00:03:11 2013 -0700 +++ b/render_sdl.c Tue Oct 29 19:09:19 2013 -0700 @@ -5,6 +5,7 @@ */ #include <stdlib.h> #include <stdio.h> +#include <math.h> #include "render.h" #include "blastem.h" #include "io.h" @@ -101,7 +102,7 @@ #ifndef DISABLE_OPENGL GLuint textures[3], buffers[2], vshader, fshader, program, un_textures[2], at_pos; -const GLfloat vertex_data[] = { +GLfloat vertex_data[] = { -1.0f, -1.0f, 1.0f, -1.0f, -1.0f, 1.0f, @@ -259,16 +260,25 @@ if (use_gl) { GLenum res = glewInit(); - if (res != GLEW_OK) - { + if (res != GLEW_OK) { fprintf(stderr, "Initialization of GLEW failed with code %d\n", res); exit(1); } - if (!GLEW_VERSION_2_0) - { + if (!GLEW_VERSION_2_0) { fputs("OpenGL 2.0 is unable, falling back to standard SDL rendering\n", stderr); exit(1); } + float aspect = (float)width / height; + if (fabs(aspect - 4.0/3.0) > 0.01 && strcmp(tern_find_ptr_default(config, "videoaspect", "normal"), "stretch")) { + for (int i = 0; i < 4; i++) + { + if (aspect > 4.0/3.0) { + vertex_data[i*2] *= (4.0/3.0)/aspect; + } else { + vertex_data[i*2+1] *= aspect/(4.0/3.0); + } + } + } } render_gl = use_gl; #endif