diff options
| -rw-r--r-- | progs/tests/mipmap_view.c | 267 |
1 files changed, 219 insertions, 48 deletions
diff --git a/progs/tests/mipmap_view.c b/progs/tests/mipmap_view.c index 85fc67ac79..808d348699 100644 --- a/progs/tests/mipmap_view.c +++ b/progs/tests/mipmap_view.c @@ -18,12 +18,27 @@ #define TEXTURE_FILE "../images/arch.rgb" -static int TexWidth = 256, TexHeight = 256; +#define LEVELS 8 +#define SIZE (1<<LEVELS) +static int TexWidth = SIZE, TexHeight = SIZE; static int WinWidth = 1044, WinHeight = 900; static GLfloat Bias = 0.0; static GLboolean ScaleQuads = GL_FALSE; static GLboolean Linear = GL_FALSE; static GLint Win = 0; +static GLint RenderTextureLevel = 0; +static GLuint TexObj; + + + +static void +CheckError(int line) +{ + GLenum err = glGetError(); + if (err) { + printf("GL Error 0x%x at line %d\n", (int) err, line); + } +} @@ -37,6 +52,178 @@ PrintString(const char *s) } + + +static void +MipGenTexture( void ) +{ + /* test auto mipmap generation */ + GLint width, height, i; + GLenum format; + GLubyte *image = LoadRGBImage(TEXTURE_FILE, &width, &height, &format); + if (!image) { + printf("Error: could not load texture image %s\n", TEXTURE_FILE); + exit(1); + } + /* resize to TexWidth x TexHeight */ + if (width != TexWidth || height != TexHeight) { + GLubyte *newImage = malloc(TexWidth * TexHeight * 4); + + fprintf(stderr, "rescale %d %d to %d %d\n", width, height, + TexWidth, TexHeight); + fflush(stderr); + + gluScaleImage(format, width, height, GL_UNSIGNED_BYTE, image, + TexWidth, TexHeight, GL_UNSIGNED_BYTE, newImage); + free(image); + image = newImage; + } + printf("Using GL_SGIS_generate_mipmap\n"); + glTexParameteri(GL_TEXTURE_2D, GL_GENERATE_MIPMAP_SGIS, GL_TRUE); + glTexImage2D(GL_TEXTURE_2D, 0, format, TexWidth, TexHeight, 0, + format, GL_UNSIGNED_BYTE, image); + free(image); + + /* make sure mipmap was really generated correctly */ + width = TexWidth; + height = TexHeight; + for (i = 0; i < 9; i++) { + GLint w, h; + glGetTexLevelParameteriv(GL_TEXTURE_2D, i, GL_TEXTURE_WIDTH, &w); + glGetTexLevelParameteriv(GL_TEXTURE_2D, i, GL_TEXTURE_HEIGHT, &h); + printf("Level %d size: %d x %d\n", i, w, h); + assert(w == width); + assert(h == height); + width /= 2; + height /= 2; + } + + + glTexParameteri(GL_TEXTURE_2D, GL_GENERATE_MIPMAP_SGIS, GL_FALSE); +} + + + +static void +ResetTextureLevel( int i ) +{ + GLubyte tex2d[SIZE*SIZE][4]; + + { + GLint Width = TexWidth / (1 << i); + GLint Height = TexHeight / (1 << i); + GLint s, t; + + for (s = 0; s < Width; s++) { + for (t = 0; t < Height; t++) { + tex2d[t*Width+s][0] = ((s / 16) % 2) ? 0 : 255; + tex2d[t*Width+s][1] = ((t / 16) % 2) ? 0 : 255; + tex2d[t*Width+s][2] = 128; + tex2d[t*Width+s][3] = 255; + } + } + + glPixelStorei(GL_UNPACK_ALIGNMENT, 1); + + glTexImage2D(GL_TEXTURE_2D, i, GL_RGB, Width, Height, 0, + GL_RGBA, GL_UNSIGNED_BYTE, tex2d); + } +} + + +static void +ResetTexture( void ) +{ +#if 0 + /* This doesn't work so well as the arch texture is 512x512. + */ + LoadRGBMipmaps(TEXTURE_FILE, GL_RGB); +#else + { + int i; + + for (i = 0; i <= LEVELS; i++) + { + ResetTextureLevel(i); + } + } +#endif +} + + + + + + + +static void +RenderTexture( void ) +{ + GLenum status; + GLuint MyFB; + + fprintf(stderr, "RenderTextureLevel %d\n", RenderTextureLevel); + fflush(stderr); + + /* gen framebuffer id, delete it, do some assertions, just for testing */ + glGenFramebuffersEXT(1, &MyFB); + glBindFramebufferEXT(GL_FRAMEBUFFER_EXT, MyFB); + assert(glIsFramebufferEXT(MyFB)); + + CheckError(__LINE__); + + /* Render color to texture */ + glFramebufferTexture2DEXT(GL_FRAMEBUFFER_EXT, + GL_COLOR_ATTACHMENT0_EXT, + GL_TEXTURE_2D, TexObj, + RenderTextureLevel); + + + + CheckError(__LINE__); + + + glMatrixMode(GL_PROJECTION); + glLoadIdentity(); + glOrtho(-1.0, 1.0, -1.0, 1.0, 5.0, 25.0); + glMatrixMode(GL_MODELVIEW); + glLoadIdentity(); + glTranslatef(0.0, 0.0, -15.0); + + status = glCheckFramebufferStatusEXT(GL_FRAMEBUFFER_EXT); + if (status != GL_FRAMEBUFFER_COMPLETE_EXT) { + printf("Framebuffer incomplete!!!\n"); + } + + glViewport(0, 0, + TexWidth / (1 << RenderTextureLevel), + TexHeight / (1 << RenderTextureLevel)); + + glClearColor(0.5, 0.5, 1.0, 0.0); + glClear(GL_COLOR_BUFFER_BIT); + + CheckError(__LINE__); + + glBegin(GL_POLYGON); + glColor3f(1, 0, 0); + glVertex2f(-1, -1); + glColor3f(0, 1, 0); + glVertex2f(1, -1); + glColor3f(0, 0, 1); + glVertex2f(0, 1); + glEnd(); + + + /* Bind normal framebuffer */ + glBindFramebufferEXT(GL_FRAMEBUFFER_EXT, 0); + CheckError(__LINE__); + + glDeleteFramebuffersEXT(1, &MyFB); + CheckError(__LINE__); + + glClearColor(0, 0, 0, 0); +} + static void Display(void) { @@ -44,6 +231,8 @@ Display(void) char str[100]; int texWidth = TexWidth, texHeight = TexHeight; + glViewport(0, 0, WinHeight, WinHeight); + glClear(GL_COLOR_BUFFER_BIT); glMatrixMode(GL_PROJECTION); @@ -126,7 +315,6 @@ Reshape(int width, int height) { WinWidth = width; WinHeight = height; - glViewport(0, 0, width, height); } @@ -145,6 +333,21 @@ Key(unsigned char key, int x, int y) case 'l': Linear = !Linear; break; + case 'v': + RenderTextureLevel++; + break; + case 'V': + RenderTextureLevel--; + break; + case 'r': + RenderTexture(); + break; + case 'X': + ResetTexture(); + break; + case 'x': + ResetTextureLevel(RenderTextureLevel); + break; case '0': case '1': case '2': @@ -160,6 +363,14 @@ Key(unsigned char key, int x, int y) case 's': ScaleQuads = !ScaleQuads; break; + case ' ': + MipGenTexture(); + Bias = 0; + Linear = 0; + RenderTextureLevel = 0; + ScaleQuads = 0; + break; + case 27: glutDestroyWindow(Win); exit(0); @@ -186,53 +397,13 @@ Init(void) glPixelStorei(GL_UNPACK_ALIGNMENT, 1); - if (1) { - /* test auto mipmap generation */ - GLint width, height, i; - GLenum format; - GLubyte *image = LoadRGBImage(TEXTURE_FILE, &width, &height, &format); - if (!image) { - printf("Error: could not load texture image %s\n", TEXTURE_FILE); - exit(1); - } - /* resize to TexWidth x TexHeight */ - if (width != TexWidth || height != TexHeight) { - GLubyte *newImage = malloc(TexWidth * TexHeight * 4); - gluScaleImage(format, width, height, GL_UNSIGNED_BYTE, image, - TexWidth, TexHeight, GL_UNSIGNED_BYTE, newImage); - free(image); - image = newImage; - } - printf("Using GL_SGIS_generate_mipmap\n"); - glTexParameteri(GL_TEXTURE_2D, GL_GENERATE_MIPMAP_SGIS, GL_TRUE); - glTexImage2D(GL_TEXTURE_2D, 0, format, TexWidth, TexHeight, 0, - format, GL_UNSIGNED_BYTE, image); - free(image); - - /* make sure mipmap was really generated correctly */ - width = TexWidth; - height = TexHeight; - for (i = 0; i < 9; i++) { - GLint w, h; - glGetTexLevelParameteriv(GL_TEXTURE_2D, i, GL_TEXTURE_WIDTH, &w); - glGetTexLevelParameteriv(GL_TEXTURE_2D, i, GL_TEXTURE_HEIGHT, &h); - printf("Level %d size: %d x %d\n", i, w, h); - assert(w == width); - assert(h == height); - width /= 2; - height /= 2; - } - } - else { - if (LoadRGBMipmaps(TEXTURE_FILE, GL_RGB)) { - printf("Using gluBuildMipmaps()\n"); - } - else { - printf("Error: could not load texture image %s\n", TEXTURE_FILE); - exit(1); - } - } + glGenTextures(1, &TexObj); + glBindTexture(GL_TEXTURE_2D, TexObj); + if (1) + MipGenTexture(); + else + ResetTexture(); /* mipmapping required for this extension */ glTexEnvi(GL_TEXTURE_ENV, GL_TEXTURE_ENV_MODE, GL_MODULATE); |