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Gravlensing for OpenGL

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This commit is contained in:
Simon Robertshaw 2011-10-21 23:38:48 +01:00
parent 57f6ac0f3a
commit 7ed4ad2fd8
1 changed files with 58 additions and 4 deletions
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60
src/graphics.c
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@ -27,7 +27,7 @@ unsigned cmode = CM_FIRE;
SDL_Surface *sdl_scrn;
int sdl_scale = 1;
GLuint vidBuf, airBuf, fireAlpha, glowAlpha, blurAlpha, fireProg, partsFboTex, partsFbo;
GLuint vidBuf, airBuf, fireAlpha, glowAlpha, blurAlpha, fireProg, partsFboTex, partsFbo, lensProg, partsTFX, partsTFY;
int sandcolour_r = 0;
int sandcolour_g = 0;
@ -1959,7 +1959,22 @@ void render_parts(pixel *vid)
//Drawing the FBO onto the screen sounds like a cool idea now
glEnable( GL_TEXTURE_2D );
glUseProgram(lensProg);
glActiveTexture(GL_TEXTURE0);
glBindTexture(GL_TEXTURE_2D, partsFboTex);
glUniform1i(glGetUniformLocation(lensProg, "pTex"), 0);
glActiveTexture(GL_TEXTURE1);
glBindTexture(GL_TEXTURE_2D, partsTFX);
glTexSubImage2D(GL_TEXTURE_2D, 0, 0, 0, XRES, YRES, GL_RED, GL_FLOAT, gravxf);
glUniform1i(glGetUniformLocation(lensProg, "tfX"), 1);
glActiveTexture(GL_TEXTURE2);
glBindTexture(GL_TEXTURE_2D, partsTFY);
glTexSubImage2D(GL_TEXTURE_2D, 0, 0, 0, XRES, YRES, GL_GREEN, GL_FLOAT, gravyf);
glUniform1i(glGetUniformLocation(lensProg, "tfY"), 2);
glActiveTexture(GL_TEXTURE0);
//glUniform1f(glGetUniformLocation(lensProg, "xres"), (float)XRES);
//glUniform1f(glGetUniformLocation(lensProg, "yres"), (float)YRES);
glColor4f(1.0f, 1.0f, 1.0f, 1.0f);
glBegin(GL_QUADS);
glTexCoord2d(1, 0);
@ -1971,6 +1986,8 @@ void render_parts(pixel *vid)
glTexCoord2d(1, 1);
glVertex3f(XRES*sdl_scale, 0, 1.0);
glEnd();
glUseProgram(0);
glDisable( GL_TEXTURE_2D );
//Reset coords/offset
@ -3109,6 +3126,26 @@ int sdl_open(void)
glBindTexture(GL_TEXTURE_2D, 0);
glDisable(GL_TEXTURE_2D);
//Texture for velocity maps for gravity
glEnable(GL_TEXTURE_2D);
glGenTextures(1, &partsTFX);
glBindTexture(GL_TEXTURE_2D, partsTFX);
glTexImage2D(GL_TEXTURE_2D, 0, GL_RGBA32F, XRES, YRES, 0, GL_BGRA, GL_UNSIGNED_BYTE, NULL);
glTexParameteri(GL_TEXTURE_2D,GL_TEXTURE_MAG_FILTER,GL_NEAREST);
glTexParameteri(GL_TEXTURE_2D,GL_TEXTURE_MIN_FILTER,GL_NEAREST);
glBindTexture(GL_TEXTURE_2D, 0);
glGenTextures(1, &partsTFY);
glBindTexture(GL_TEXTURE_2D, partsTFY);
glTexImage2D(GL_TEXTURE_2D, 0, GL_RGBA32F, XRES, YRES, 0, GL_BGRA, GL_UNSIGNED_BYTE, NULL);
glTexParameteri(GL_TEXTURE_2D,GL_TEXTURE_MAG_FILTER,GL_NEAREST);
glTexParameteri(GL_TEXTURE_2D,GL_TEXTURE_MIN_FILTER,GL_NEAREST);
glBindTexture(GL_TEXTURE_2D, 0);
glDisable(GL_TEXTURE_2D);
//Fire alpha texture
glEnable(GL_TEXTURE_2D);
glGenTextures(1, &fireAlpha);
@ -3185,12 +3222,14 @@ void loadShaders()
{
GLuint vsize, fsize, vertexShader, fragmentShader;
//const char *vertex = file_load("test.vert", &vsize), * fragment = file_load("test.frag", &fsize);
const char *lensVertex = file_load("ltest.vert", &vsize), * lensFragment = file_load("ltest.frag", &fsize);
//Particle texture
vertexShader = glCreateShader(GL_VERTEX_SHADER);
fragmentShader = glCreateShader(GL_FRAGMENT_SHADER);
glShaderSource( vertexShader, 1, &vertex, &vsize);
glShaderSource( fragmentShader, 1, &fragment, &fsize);
glShaderSource( vertexShader, 1, &vertex, NULL);//&vsize);
glShaderSource( fragmentShader, 1, &fragment, NULL);//&fsize);
glCompileShader( vertexShader );
glCompileShader( fragmentShader );
@ -3199,6 +3238,21 @@ void loadShaders()
glAttachShader( fireProg, vertexShader );
glAttachShader( fireProg, fragmentShader );
glLinkProgram( fireProg );
//Lensing
vertexShader = glCreateShader(GL_VERTEX_SHADER);
fragmentShader = glCreateShader(GL_FRAGMENT_SHADER);
glShaderSource( vertexShader, 1, &lensVertex, &vsize);
glShaderSource( fragmentShader, 1, &lensFragment, &fsize);
glCompileShader( vertexShader );
glCompileShader( fragmentShader );
lensProg = glCreateProgram();
glAttachShader( lensProg, vertexShader );
glAttachShader( lensProg, fragmentShader );
glLinkProgram( lensProg );
}
int draw_debug_info(pixel* vid, int lm, int lx, int ly, int cx, int cy, int line_x, int line_y)