From 448bc3facd39750ca795007ff1a0cc88f4b32b74 Mon Sep 17 00:00:00 2001 From: ehofman Date: Thu, 27 Jan 2005 10:56:22 +0000 Subject: [PATCH] Add a RenderTexture test program. --- simgear/screen/TestRenderTexture.cpp | 331 +++++++++++++++++++++++++++ 1 file changed, 331 insertions(+) create mode 100644 simgear/screen/TestRenderTexture.cpp diff --git a/simgear/screen/TestRenderTexture.cpp b/simgear/screen/TestRenderTexture.cpp new file mode 100644 index 00000000..70d21151 --- /dev/null +++ b/simgear/screen/TestRenderTexture.cpp @@ -0,0 +1,331 @@ + +#include + +#include SG_GL_H +#include +#include +#include + +#include +#include + +void Reshape(int w, int h); + +GLuint iTextureProgram = 0; +GLuint iPassThroughProgram = 0; + +RenderTexture *rt = NULL; + +float rectAngle = 0; +float torusAngle = 0; +bool bTorusMotion = true; +bool bRectMotion = true; +bool bShowDepthTexture = false; + +static const char *g_modeTestStrings[] = +{ + "rgb tex2D", + "rgba tex2D depthTex2D", + "rgba=8 depthTexRECT ctt", + "rgba samples=4 tex2D ctt", + "rgba=8 tex2D mipmap", + "rgb=5,6,5 tex2D", + "rgba=16f texRECT", + "rgba=32f texRECT depthTexRECT", + "rgba=16f texRECT depthTexRECT ctt", + "r=32f texRECT depth ctt", + "rgb double tex2D", + "r=32f texRECT ctt aux=4" +}; + +static int g_numModeTestStrings = sizeof(g_modeTestStrings) / sizeof(char*); +static int g_currentString = 0; + +//--------------------------------------------------------------------------- +// Function : PrintGLerror +// Description : +//--------------------------------------------------------------------------- +void PrintGLerror( char *msg ) +{ + GLenum errCode; + const GLubyte *errStr; + + if ((errCode = glGetError()) != GL_NO_ERROR) + { + errStr = gluErrorString(errCode); + fprintf(stderr,"OpenGL ERROR: %s: %s\n", errStr, msg); + } +} + +//--------------------------------------------------------------------------- +// Function : CreateRenderTexture +// Description : +//--------------------------------------------------------------------------- +RenderTexture* CreateRenderTexture(const char *initstr) +{ + printf("\nCreating with init string: \"%s\"\n", initstr); + + int texWidth = 256, texHeight = 256; + + // Test deprecated interface + //RenderTexture *rt2 = new RenderTexture(texWidth, texHeight); + //if (!rt2->Initialize(true,false,false,false,false,8,8,8,0)) + + RenderTexture *rt2 = new RenderTexture(); + rt2->Reset(initstr); + if (!rt2->Initialize(texWidth, texHeight)) + { + fprintf(stderr, "RenderTexture Initialization failed!\n"); + } + + // for shadow mapping we still have to bind it and set the correct + // texture parameters using the SGI_shadow or ARB_shadow extension + // setup the rendering context for the RenderTexture + if (rt2->BeginCapture()) + { + Reshape(texWidth, texHeight); + glMatrixMode(GL_MODELVIEW); + glLoadIdentity(); + gluLookAt(0, 0, 3, 0, 0, 0, 0, 1, 0); + glEnable(GL_LIGHTING); + glEnable(GL_LIGHT0); + glEnable(GL_COLOR_MATERIAL); + glEnable(GL_CULL_FACE); + glEnable(GL_DEPTH_TEST); + glClearColor(0.2, 0.2, 0.2, 1); + rt2->EndCapture(); + } + + // enable linear filtering if available + if (rt2->IsTexture() || rt2->IsDepthTexture()) + { + if (rt2->IsMipmapped()) + { + // Enable trilinear filtering so we can see the mipmapping + if (rt2->IsTexture()) + { + rt2->Bind(); + glTexParameteri(rt2->GetTextureTarget(), + GL_TEXTURE_MIN_FILTER, GL_LINEAR_MIPMAP_LINEAR); + glTexParameteri(rt2->GetTextureTarget(), + GL_TEXTURE_MAG_FILTER, GL_LINEAR); + glTexParameteri(rt2->GetTextureTarget(), + GL_GENERATE_MIPMAP_SGIS, GL_TRUE); + } + + if (rt2->IsDepthTexture()) + { + rt2->BindDepth(); + glTexParameteri(rt2->GetTextureTarget(), + GL_TEXTURE_MIN_FILTER, GL_LINEAR_MIPMAP_LINEAR); + glTexParameteri(rt2->GetTextureTarget(), + GL_TEXTURE_MAG_FILTER, GL_LINEAR); + glTexParameteri(rt2->GetTextureTarget(), + GL_GENERATE_MIPMAP_SGIS, GL_TRUE); + } + } + else if (!(rt2->IsRectangleTexture() || rt2->IsFloatTexture())) + { + if (rt2->IsTexture()) + { + rt2->Bind(); + glTexParameteri(rt2->GetTextureTarget(), + GL_TEXTURE_MIN_FILTER, GL_LINEAR); + glTexParameteri(rt2->GetTextureTarget(), + GL_TEXTURE_MAG_FILTER, GL_LINEAR); + } + + if (rt2->IsDepthTexture()) + { + rt2->BindDepth(); + glTexParameteri(rt2->GetTextureTarget(), + GL_TEXTURE_MIN_FILTER, GL_LINEAR); + glTexParameteri(rt2->GetTextureTarget(), + GL_TEXTURE_MAG_FILTER, GL_LINEAR); + } + } + } + + if (rt2->IsDepthTexture()) + { + fprintf(stderr, + "\nPress the spacebar to toggle color / depth textures.\n"); + if (!rt2->IsTexture()) + bShowDepthTexture = true; + } + else + { + if (rt2->IsTexture()) + bShowDepthTexture = false; + } + + PrintGLerror("Create"); + return rt2; +} + +//--------------------------------------------------------------------------- +// Function : DestroyRenderTexture +// Description : +//--------------------------------------------------------------------------- +void DestroyRenderTexture(RenderTexture *rt2) +{ + delete rt2; +} + +//--------------------------------------------------------------------------- +// Function : Keyboard +// Description : +//--------------------------------------------------------------------------- +void Keyboard(unsigned char key, int x, int y) +{ + switch(key) + { + case 27: + case 'q': + exit(0); + break; + case ' ': + bShowDepthTexture = !bShowDepthTexture; + break; + case 13: + ++g_currentString%=g_numModeTestStrings; + DestroyRenderTexture(rt); + rt = CreateRenderTexture(g_modeTestStrings[g_currentString]); + break; + case 't': + bTorusMotion = !bTorusMotion; + break; + case 'r': + bRectMotion = !bRectMotion; + break; + default: + return; + } +} + +//--------------------------------------------------------------------------- +// Function : Idle +// Description : +//--------------------------------------------------------------------------- +void Idle() +{ + // make sure we don't try to display nonexistent textures + if (!rt->IsDepthTexture()) + bShowDepthTexture = false; + + if (bRectMotion) rectAngle += 1; + if (bTorusMotion) torusAngle += 1; + glutPostRedisplay(); +} + +//--------------------------------------------------------------------------- +// Function : Reshape +// Description : +//--------------------------------------------------------------------------- +void Reshape(int w, int h) +{ + if (h == 0) h = 1; + + glViewport(0, 0, w, h); + + glMatrixMode(GL_PROJECTION); + glLoadIdentity(); + + gluPerspective(60.0, (GLfloat)w/(GLfloat)h, 1, 5.0); +} + +//--------------------------------------------------------------------------- +// Function : Display +// Description : +//--------------------------------------------------------------------------- +void _Display() +{ + if (rt->IsInitialized() && rt->BeginCapture()) + { + if (rt->IsDoubleBuffered()) glDrawBuffer(GL_BACK); + glMatrixMode(GL_MODELVIEW); + glPushMatrix(); + + glRotatef(torusAngle, 1, 0, 0); + glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT); + glColor3f(1,1,0); + + glutSolidTorus(0.25, 1, 32, 64); + + glPopMatrix(); + PrintGLerror("RT Update"); + + rt->EndCapture(); + } + + glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT); + glColor3f(1, 1, 1); + glMatrixMode(GL_MODELVIEW); + glPushMatrix(); + glRotatef(rectAngle / 10, 0, 1, 0); + + if(bShowDepthTexture && rt->IsDepthTexture()) + rt->BindDepth(); + else if (rt->IsTexture()) { + rt->Bind(); + } + + rt->EnableTextureTarget(); + + int maxS = rt->GetMaxS(); + int maxT = rt->GetMaxT(); + + glBegin(GL_QUADS); + glTexCoord2f(0, 0); glVertex2f(-1, -1); + glTexCoord2f(maxS, 0); glVertex2f( 1, -1); + glTexCoord2f(maxS, maxT); glVertex2f( 1, 1); + glTexCoord2f(0, maxT); glVertex2f(-1, 1); + glEnd(); + + rt->DisableTextureTarget(); + + glPopMatrix(); + + PrintGLerror("display"); + glutSwapBuffers(); +} + + + + +//--------------------------------------------------------------------------- +// Function : main +// Description : +//--------------------------------------------------------------------------- +int main() +{ + glutInitDisplayMode(GLUT_RGB | GLUT_DEPTH | GLUT_DOUBLE); + glutInitWindowPosition(50, 50); + glutInitWindowSize(512, 512); + glutCreateWindow("TestRenderTexture"); + + glutDisplayFunc(_Display); + glutIdleFunc(Idle); + glutReshapeFunc(Reshape); + glutKeyboardFunc(Keyboard); + + Reshape(512, 512); + glMatrixMode(GL_MODELVIEW); + glLoadIdentity(); + gluLookAt(0, 0, 2, 0, 0, 0, 0, 1, 0); + glDisable(GL_LIGHTING); + glEnable(GL_COLOR_MATERIAL); + glEnable(GL_DEPTH_TEST); + glClearColor(0.4, 0.6, 0.8, 1); + + + rt = CreateRenderTexture(g_modeTestStrings[g_currentString]); + + printf("Press Enter to change RenderTexture parameters.\n" + "Press 'r' to toggle the rectangle's motion.\n" + "Press 't' to toggle the torus' motion.\n"); + + + glutMainLoop(); + return 0; +} -- 2.39.5