libpsys

annotate src/psys_gl.c @ 16:3871a45a4e4b

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Almost there
author John Tsiombikas <nuclear@mutantstargoat.com>
date Tue, 11 Sep 2012 02:13:12 +0300
parents 9c24273f211b
children 0a53b22f7caf
rev   line source
nuclear@5 1 #include <string.h>
nuclear@5 2 #include <errno.h>
nuclear@16 3 #include <assert.h>
nuclear@5 4
nuclear@0 5 #ifndef __APPLE__
nuclear@5 6 #ifdef WIN32
nuclear@5 7 #include <windows.h>
nuclear@5 8 #endif
nuclear@5 9
nuclear@0 10 #include <GL/gl.h>
nuclear@0 11 #else
nuclear@0 12 #include <OpenGL/gl.h>
nuclear@0 13 #endif
nuclear@0 14
nuclear@5 15 #include <imago2.h>
nuclear@5 16 #include "psys.h"
nuclear@5 17 #include "psys_gl.h"
nuclear@0 18
nuclear@0 19 void psys_gl_draw_start(struct psys_emitter *em, void *cls)
nuclear@0 20 {
nuclear@0 21 float xform[16];
nuclear@0 22
nuclear@0 23 glMatrixMode(GL_MODELVIEW);
nuclear@0 24 glPushMatrix();
nuclear@0 25
nuclear@0 26 glGetFloatv(GL_MODELVIEW_MATRIX, xform);
nuclear@2 27 xform[0] = xform[5] = xform[10] = 1.0;
nuclear@2 28 xform[1] = xform[2] = xform[4] = xform[6] = xform[8] = xform[9] = 0.0;
nuclear@0 29
nuclear@0 30 glLoadMatrixf(xform);
nuclear@0 31
nuclear@0 32 glPushAttrib(GL_ENABLE_BIT);
nuclear@0 33 glDisable(GL_LIGHTING);
nuclear@0 34
nuclear@2 35 glEnable(GL_BLEND);
nuclear@3 36 glBlendFunc(GL_SRC_ALPHA, GL_ONE);
nuclear@2 37
nuclear@5 38 if(em->attr.tex) {
nuclear@2 39 glEnable(GL_TEXTURE_2D);
nuclear@5 40 glBindTexture(GL_TEXTURE_2D, em->attr.tex);
nuclear@2 41 }
nuclear@2 42
nuclear@0 43 glDepthMask(0);
nuclear@0 44
nuclear@0 45 glBegin(GL_QUADS);
nuclear@0 46 glColor3f(1, 1, 1);
nuclear@0 47 }
nuclear@0 48
nuclear@0 49 void psys_gl_draw(struct psys_emitter *em, struct psys_particle *p, void *cls)
nuclear@0 50 {
nuclear@0 51 float hsz = p->size / 2.0;
nuclear@0 52
nuclear@9 53 glColor4f(p->color.x, p->color.y, p->color.z, p->alpha);
nuclear@9 54
nuclear@0 55 glTexCoord2f(0, 0);
nuclear@0 56 glVertex3f(p->pos.x - hsz, p->pos.y - hsz, p->pos.z);
nuclear@0 57
nuclear@0 58 glTexCoord2f(1, 0);
nuclear@0 59 glVertex3f(p->pos.x + hsz, p->pos.y - hsz, p->pos.z);
nuclear@0 60
nuclear@0 61 glTexCoord2f(1, 1);
nuclear@0 62 glVertex3f(p->pos.x + hsz, p->pos.y + hsz, p->pos.z);
nuclear@0 63
nuclear@0 64 glTexCoord2f(0, 1);
nuclear@0 65 glVertex3f(p->pos.x - hsz, p->pos.y + hsz, p->pos.z);
nuclear@0 66 }
nuclear@0 67
nuclear@0 68 void psys_gl_draw_end(struct psys_emitter *em, void *cls)
nuclear@0 69 {
nuclear@0 70 glEnd();
nuclear@0 71
nuclear@0 72 glDepthMask(1);
nuclear@0 73 glPopAttrib();
nuclear@0 74
nuclear@0 75 glMatrixMode(GL_MODELVIEW);
nuclear@0 76 glPopMatrix();
nuclear@0 77 }
nuclear@5 78
nuclear@5 79
nuclear@5 80 unsigned int psys_gl_load_texture(const char *fname, void *cls)
nuclear@5 81 {
nuclear@5 82 unsigned int tex;
nuclear@5 83 void *pixels;
nuclear@5 84 int xsz, ysz;
nuclear@5 85
nuclear@5 86 if(!(pixels = img_load_pixels(fname, &xsz, &ysz, IMG_FMT_RGBA32))) {
nuclear@5 87 return 0;
nuclear@5 88 }
nuclear@16 89 printf("%s: creating texture %s (%dx%d)\n", __func__, fname, xsz, ysz);
nuclear@5 90
nuclear@5 91 glGenTextures(1, &tex);
nuclear@5 92 glBindTexture(GL_TEXTURE_2D, tex);
nuclear@5 93 glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR);
nuclear@5 94 glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR);
nuclear@5 95 glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_CLAMP);
nuclear@5 96 glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_CLAMP);
nuclear@16 97 glTexImage2D(GL_TEXTURE_2D, 0, GL_RGBA, xsz, ysz, 0, GL_RGBA, GL_UNSIGNED_BYTE, pixels);
nuclear@16 98
nuclear@16 99 assert(glGetError() == GL_NO_ERROR);
nuclear@5 100
nuclear@5 101 img_free_pixels(pixels);
nuclear@5 102 return tex;
nuclear@5 103 }
nuclear@5 104
nuclear@5 105 void psys_gl_unload_texture(unsigned int tex, void *cls)
nuclear@5 106 {
nuclear@5 107 glDeleteTextures(1, &tex);
nuclear@5 108 }