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-rw-r--r--progs/demos/texdown.c153
1 files changed, 72 insertions, 81 deletions
diff --git a/progs/demos/texdown.c b/progs/demos/texdown.c
index a381f3b6581..deb13abcafb 100644
--- a/progs/demos/texdown.c
+++ b/progs/demos/texdown.c
@@ -1,4 +1,4 @@
-/* $Id: texdown.c,v 1.1 2000/01/28 16:25:44 brianp Exp $ */
+/* $Id: texdown.c,v 1.2 2000/03/29 15:47:48 brianp Exp $ */
/*
* Copyright (C) 1999 Brian Paul All Rights Reserved.
@@ -41,8 +41,6 @@
static GLsizei MaxSize = 1024;
static GLsizei TexWidth = 256, TexHeight = 256, TexBorder = 0;
-static GLenum TexFormat = GL_RGBA, TexType = GL_UNSIGNED_BYTE;
-static GLenum TexIntFormat = GL_RGBA;
static GLboolean ScaleAndBias = GL_FALSE;
static GLboolean SubImage = GL_FALSE;
static GLdouble DownloadRate = 0.0; /* texels/sec */
@@ -50,34 +48,29 @@ static GLdouble DownloadRate = 0.0; /* texels/sec */
static GLuint Mode = 0;
-static int
-BytesPerTexel(GLenum format, GLenum type)
-{
- int b, c;
+#define NUM_FORMATS 4
+struct FormatRec {
+ GLenum Format;
+ GLenum Type;
+ GLenum IntFormat;
+ GLint TexelSize;
+};
- switch (type) {
- case GL_UNSIGNED_BYTE:
- b = 1;
- break;
- case GL_UNSIGNED_SHORT:
- b = 2;
- break;
- default:
- abort();
- }
- switch (format) {
- case GL_RGB:
- c = 3;
- break;
- case GL_RGBA:
- c = 4;
- break;
- default:
- abort();
- }
+static const struct FormatRec FormatTable[NUM_FORMATS] = {
+ /* Format Type IntFormat TexelSize */
+ { GL_RGB, GL_UNSIGNED_BYTE, GL_RGB, 3 },
+ { GL_RGBA, GL_UNSIGNED_BYTE, GL_RGBA, 4 },
+ { GL_RGBA, GL_UNSIGNED_BYTE, GL_RGB, 4 },
+ { GL_RGB, GL_UNSIGNED_SHORT_5_6_5, GL_RGB, 2 },
+};
+static GLint Format;
- return b * c;
+
+static int
+BytesPerTexel(GLint format)
+{
+ return FormatTable[format].TexelSize;
}
@@ -100,9 +93,13 @@ TypeStr(GLenum type)
{
switch (type) {
case GL_UNSIGNED_BYTE:
- return "GLubyte";
+ return "GL_UNSIGNED_BYTE";
case GL_UNSIGNED_SHORT:
- return "GLushort";
+ return "GL_UNSIGNED_SHORT";
+ case GL_UNSIGNED_SHORT_5_6_5:
+ return "GL_UNSIGNED_SHORT_5_6_5";
+ case GL_UNSIGNED_SHORT_5_6_5_REV:
+ return "GL_UNSIGNED_SHORT_5_6_5_REV";
default:
return "";
}
@@ -114,7 +111,7 @@ MeasureDownloadRate(void)
{
const int w = TexWidth + 2 * TexBorder;
const int h = TexHeight + 2 * TexBorder;
- const int bytes = w * h * BytesPerTexel(TexFormat, TexType);
+ const int bytes = w * h * BytesPerTexel(Format);
GLubyte *texImage, *getImage;
GLdouble t0, t1, time;
int count;
@@ -156,11 +153,27 @@ MeasureDownloadRate(void)
do {
if (SubImage && count > 0) {
glTexSubImage2D(GL_TEXTURE_2D, 0, -TexBorder, -TexBorder, w, h,
- TexFormat, TexType, texImage);
+ FormatTable[Format].Format,
+ FormatTable[Format].Type, texImage);
}
else {
- glTexImage2D(GL_TEXTURE_2D, 0, TexIntFormat, w, h,
- TexBorder, TexFormat, TexType, texImage);
+ glTexImage2D(GL_TEXTURE_2D, 0,
+ FormatTable[Format].IntFormat, w, h, TexBorder,
+ FormatTable[Format].Format,
+ FormatTable[Format].Type, texImage);
+ }
+
+ if (count == 0) {
+ /* draw a tiny polygon to force texture into texram */
+ glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR);
+ glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR);
+ glEnable(GL_TEXTURE_2D);
+ glBegin(GL_TRIANGLES);
+ glTexCoord2f(0, 0); glVertex2f(1, 1);
+ glTexCoord2f(1, 0); glVertex2f(3, 1);
+ glTexCoord2f(0.5, 1); glVertex2f(2, 3);
+ glEnd();
+ glDisable(GL_TEXTURE_2D);
}
t1 = glutGet(GLUT_ELAPSED_TIME) * 0.001;
@@ -174,7 +187,9 @@ MeasureDownloadRate(void)
#if 0
if (!ScaleAndBias) {
/* verify texture readback */
- glGetTexImage(GL_TEXTURE_2D, 0, TexFormat, TexType, getImage);
+ glGetTexImage(GL_TEXTURE_2D, 0,
+ FormatTable[Format].Format,
+ FormatTable[Format].Type, getImage);
for (i = 0; i < w * h; i++) {
if (texImage[i] != getImage[i]) {
printf("[%d] %d != %d\n", i, texImage[i], getImage[i]);
@@ -213,16 +228,18 @@ Display(void)
glClear(GL_COLOR_BUFFER_BIT);
- glRasterPos2i(10, 70);
+ glRasterPos2i(10, 80);
sprintf(s, "Texture size[cursor]: %d x %d Border[b]: %d", w, h, TexBorder);
PrintString(s);
- glRasterPos2i(10, 55);
- sprintf(s, "Texture format[f]: %s Type[t]: %s IntFormat[i]: %s",
- FormatStr(TexFormat), TypeStr(TexType), FormatStr(TexIntFormat));
+ glRasterPos2i(10, 65);
+ sprintf(s, "Format[f]: %s Type: %s IntFormat: %s",
+ FormatStr(FormatTable[Format].Format),
+ TypeStr( FormatTable[Format].Type),
+ FormatStr(FormatTable[Format].IntFormat));
PrintString(s);
- glRasterPos2i(10, 40);
+ glRasterPos2i(10, 50);
sprintf(s, "Pixel Scale&Bias[p]: %s TexSubImage[s]: %s",
ScaleAndBias ? "Yes" : "No",
SubImage ? "Yes" : "No");
@@ -246,8 +263,21 @@ Display(void)
glRasterPos2i(10, 10);
sprintf(s, "Download rate: %g Mtexels/second %g MB/second",
DownloadRate / 1000000.0,
- DownloadRate * BytesPerTexel(TexFormat, TexType) / 1000000.0);
+ DownloadRate * BytesPerTexel(Format) / 1000000.0);
PrintString(s);
+ {
+ GLint r, g, b, a, l, i;
+ glGetTexLevelParameteriv(GL_TEXTURE_2D, 0, GL_TEXTURE_RED_SIZE, &r);
+ glGetTexLevelParameteriv(GL_TEXTURE_2D, 0, GL_TEXTURE_GREEN_SIZE, &g);
+ glGetTexLevelParameteriv(GL_TEXTURE_2D, 0, GL_TEXTURE_BLUE_SIZE, &b);
+ glGetTexLevelParameteriv(GL_TEXTURE_2D, 0, GL_TEXTURE_ALPHA_SIZE, &a);
+ glGetTexLevelParameteriv(GL_TEXTURE_2D, 0, GL_TEXTURE_LUMINANCE_SIZE, &l);
+ glGetTexLevelParameteriv(GL_TEXTURE_2D, 0, GL_TEXTURE_INTENSITY_SIZE, &i);
+ sprintf(s, "TexelBits: R=%d G=%d B=%d A=%d L=%d I=%d", r, g, b, a, l, i);
+ glRasterPos2i(10, 25);
+ PrintString(s);
+ }
+
glutSwapBuffers();
}
}
@@ -265,35 +295,6 @@ Reshape(int width, int height)
}
-static GLenum
-NextFormat(GLenum format)
-{
- if (format == GL_RGB) {
- return GL_RGBA;
- }
- else if (format == GL_RGBA) {
- return GL_RGB;
- }
- else {
- return GL_RGBA;
- }
-}
-
-
-static GLenum
-NextType(GLenum type)
-{
- if (type == GL_UNSIGNED_BYTE) {
- return GL_UNSIGNED_SHORT;
- }
- else if (type == GL_UNSIGNED_SHORT) {
- return GL_UNSIGNED_BYTE;
- }
- else {
- return GL_UNSIGNED_SHORT;
- }
-}
-
static void
Key(unsigned char key, int x, int y)
@@ -310,12 +311,7 @@ Key(unsigned char key, int x, int y)
break;
case 'f':
/* change format */
- TexFormat = NextFormat(TexFormat);
- Mode = 0;
- break;
- case 'i':
- /* change internal format */
- TexIntFormat = NextFormat(TexIntFormat);
+ Format = (Format + 1) % NUM_FORMATS;
Mode = 0;
break;
case 'p':
@@ -327,11 +323,6 @@ Key(unsigned char key, int x, int y)
SubImage = !SubImage;
Mode = 0;
break;
- case 't':
- /* change type */
- TexType = NextType(TexType);
- Mode = 0;
- break;
case 27:
exit(0);
break;
generated by cgit v1.2.3 (git 2.39.1) at 2024-12-05 01:49:30 +0000