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Diffstat (limited to 'chromium/third_party/angle/samples/gles2_book/MipMap2D/MipMap2D.c')
| -rw-r--r-- | chromium/third_party/angle/samples/gles2_book/MipMap2D/MipMap2D.c | 346 |
1 files changed, 0 insertions, 346 deletions
diff --git a/chromium/third_party/angle/samples/gles2_book/MipMap2D/MipMap2D.c b/chromium/third_party/angle/samples/gles2_book/MipMap2D/MipMap2D.c deleted file mode 100644 index bc70cd4c08c..00000000000 --- a/chromium/third_party/angle/samples/gles2_book/MipMap2D/MipMap2D.c +++ /dev/null @@ -1,346 +0,0 @@ -// -// Book: OpenGL(R) ES 2.0 Programming Guide -// Authors: Aaftab Munshi, Dan Ginsburg, Dave Shreiner -// ISBN-10: 0321502795 -// ISBN-13: 9780321502797 -// Publisher: Addison-Wesley Professional -// URLs: http://safari.informit.com/9780321563835 -// http://www.opengles-book.com -// - -// MipMap2D.c -// -// This is a simple example that demonstrates generating a mipmap chain -// and rendering with it -// -#include <stdlib.h> -#include "esUtil.h" - -typedef struct -{ - // Handle to a program object - GLuint programObject; - - // Attribute locations - GLint positionLoc; - GLint texCoordLoc; - - // Sampler location - GLint samplerLoc; - - // Offset location - GLint offsetLoc; - - // Texture handle - GLuint textureId; - -} UserData; - - -/// -// From an RGB8 source image, generate the next level mipmap -// -GLboolean GenMipMap2D( GLubyte *src, GLubyte **dst, int srcWidth, int srcHeight, int *dstWidth, int *dstHeight ) -{ - int x, - y; - int texelSize = 3; - - *dstWidth = srcWidth / 2; - if ( *dstWidth <= 0 ) - *dstWidth = 1; - - *dstHeight = srcHeight / 2; - if ( *dstHeight <= 0 ) - *dstHeight = 1; - - *dst = malloc ( sizeof(GLubyte) * texelSize * (*dstWidth) * (*dstHeight) ); - if ( *dst == NULL ) - return GL_FALSE; - - for ( y = 0; y < *dstHeight; y++ ) - { - for( x = 0; x < *dstWidth; x++ ) - { - int srcIndex[4]; - float r = 0.0f, - g = 0.0f, - b = 0.0f; - int sample; - - // Compute the offsets for 2x2 grid of pixels in previous - // image to perform box filter - srcIndex[0] = - (((y * 2) * srcWidth) + (x * 2)) * texelSize; - srcIndex[1] = - (((y * 2) * srcWidth) + (x * 2 + 1)) * texelSize; - srcIndex[2] = - ((((y * 2) + 1) * srcWidth) + (x * 2)) * texelSize; - srcIndex[3] = - ((((y * 2) + 1) * srcWidth) + (x * 2 + 1)) * texelSize; - - // Sum all pixels - for ( sample = 0; sample < 4; sample++ ) - { - r += src[srcIndex[sample]]; - g += src[srcIndex[sample] + 1]; - b += src[srcIndex[sample] + 2]; - } - - // Average results - r /= 4.0; - g /= 4.0; - b /= 4.0; - - // Store resulting pixels - (*dst)[ ( y * (*dstWidth) + x ) * texelSize ] = (GLubyte)( r ); - (*dst)[ ( y * (*dstWidth) + x ) * texelSize + 1] = (GLubyte)( g ); - (*dst)[ ( y * (*dstWidth) + x ) * texelSize + 2] = (GLubyte)( b ); - } - } - - return GL_TRUE; -} - -/// -// Generate an RGB8 checkerboard image -// -GLubyte* GenCheckImage( int width, int height, int checkSize ) -{ - int x, - y; - GLubyte *pixels = malloc( width * height * 3 ); - - if ( pixels == NULL ) - return NULL; - - for ( y = 0; y < height; y++ ) - for ( x = 0; x < width; x++ ) - { - GLubyte rColor = 0; - GLubyte bColor = 0; - - if ( ( x / checkSize ) % 2 == 0 ) - { - rColor = 255 * ( ( y / checkSize ) % 2 ); - bColor = 255 * ( 1 - ( ( y / checkSize ) % 2 ) ); - } - else - { - bColor = 255 * ( ( y / checkSize ) % 2 ); - rColor = 255 * ( 1 - ( ( y / checkSize ) % 2 ) ); - } - - pixels[(y * height + x) * 3] = rColor; - pixels[(y * height + x) * 3 + 1] = 0; - pixels[(y * height + x) * 3 + 2] = bColor; - } - - return pixels; -} - -/// -// Create a mipmapped 2D texture image -// -GLuint CreateMipMappedTexture2D( ) -{ - // Texture object handle - GLuint textureId; - int width = 256, - height = 256; - int level; - GLubyte *pixels; - GLubyte *prevImage; - GLubyte *newImage = NULL; - - pixels = GenCheckImage( width, height, 8 ); - if ( pixels == NULL ) - return 0; - - // Generate a texture object - glGenTextures ( 1, &textureId ); - - // Bind the texture object - glBindTexture ( GL_TEXTURE_2D, textureId ); - - // Load mipmap level 0 - glTexImage2D ( GL_TEXTURE_2D, 0, GL_RGB, width, height, - 0, GL_RGB, GL_UNSIGNED_BYTE, pixels ); - - level = 1; - prevImage = &pixels[0]; - - while ( width > 1 && height > 1 ) - { - int newWidth, - newHeight; - - // Generate the next mipmap level - GenMipMap2D( prevImage, &newImage, width, height, - &newWidth, &newHeight ); - - // Load the mipmap level - glTexImage2D( GL_TEXTURE_2D, level, GL_RGB, - newWidth, newHeight, 0, GL_RGB, - GL_UNSIGNED_BYTE, newImage ); - - // Free the previous image - free ( prevImage ); - - // Set the previous image for the next iteration - prevImage = newImage; - level++; - - // Half the width and height - width = newWidth; - height = newHeight; - } - - free ( newImage ); - - // Set the filtering mode - glTexParameteri ( GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_NEAREST_MIPMAP_NEAREST ); - glTexParameteri ( GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR ); - - return textureId; - -} - - -/// -// Initialize the shader and program object -// -int Init ( ESContext *esContext ) -{ - UserData *userData = esContext->userData; - GLbyte vShaderStr[] = - "uniform float u_offset; \n" - "attribute vec4 a_position; \n" - "attribute vec2 a_texCoord; \n" - "varying vec2 v_texCoord; \n" - "void main() \n" - "{ \n" - " gl_Position = a_position; \n" - " gl_Position.x += u_offset;\n" - " v_texCoord = a_texCoord; \n" - "} \n"; - - GLbyte fShaderStr[] = - "precision mediump float; \n" - "varying vec2 v_texCoord; \n" - "uniform sampler2D s_texture; \n" - "void main() \n" - "{ \n" - " gl_FragColor = texture2D( s_texture, v_texCoord );\n" - "} \n"; - - // Load the shaders and get a linked program object - userData->programObject = esLoadProgram ( vShaderStr, fShaderStr ); - - // Get the attribute locations - userData->positionLoc = glGetAttribLocation ( userData->programObject, "a_position" ); - userData->texCoordLoc = glGetAttribLocation ( userData->programObject, "a_texCoord" ); - - // Get the sampler location - userData->samplerLoc = glGetUniformLocation ( userData->programObject, "s_texture" ); - - // Get the offset location - userData->offsetLoc = glGetUniformLocation( userData->programObject, "u_offset" ); - - // Load the texture - userData->textureId = CreateMipMappedTexture2D (); - - glClearColor ( 0.0f, 0.0f, 0.0f, 0.0f ); - return TRUE; -} - -/// -// Draw a triangle using the shader pair created in Init() -// -void Draw ( ESContext *esContext ) -{ - UserData *userData = esContext->userData; - GLfloat vVertices[] = { -0.5f, 0.5f, 0.0f, 1.5f, // Position 0 - 0.0f, 0.0f, // TexCoord 0 - -0.5f, -0.5f, 0.0f, 0.75f, // Position 1 - 0.0f, 1.0f, // TexCoord 1 - 0.5f, -0.5f, 0.0f, 0.75f, // Position 2 - 1.0f, 1.0f, // TexCoord 2 - 0.5f, 0.5f, 0.0f, 1.5f, // Position 3 - 1.0f, 0.0f // TexCoord 3 - }; - GLushort indices[] = { 0, 1, 2, 0, 2, 3 }; - - // Set the viewport - glViewport ( 0, 0, esContext->width, esContext->height ); - - // Clear the color buffer - glClear ( GL_COLOR_BUFFER_BIT ); - - // Use the program object - glUseProgram ( userData->programObject ); - - // Load the vertex position - glVertexAttribPointer ( userData->positionLoc, 4, GL_FLOAT, - GL_FALSE, 6 * sizeof(GLfloat), vVertices ); - // Load the texture coordinate - glVertexAttribPointer ( userData->texCoordLoc, 2, GL_FLOAT, - GL_FALSE, 6 * sizeof(GLfloat), &vVertices[4] ); - - glEnableVertexAttribArray ( userData->positionLoc ); - glEnableVertexAttribArray ( userData->texCoordLoc ); - - // Bind the texture - glActiveTexture ( GL_TEXTURE0 ); - glBindTexture ( GL_TEXTURE_2D, userData->textureId ); - - // Set the sampler texture unit to 0 - glUniform1i ( userData->samplerLoc, 0 ); - - // Draw quad with nearest sampling - glTexParameteri ( GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_NEAREST ); - glUniform1f ( userData->offsetLoc, -0.6f ); - glDrawElements ( GL_TRIANGLES, 6, GL_UNSIGNED_SHORT, indices ); - - // Draw quad with trilinear filtering - glTexParameteri ( GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR_MIPMAP_LINEAR ); - glUniform1f ( userData->offsetLoc, 0.6f ); - glDrawElements ( GL_TRIANGLES, 6, GL_UNSIGNED_SHORT, indices ); - - eglSwapBuffers ( esContext->eglDisplay, esContext->eglSurface ); -} - -/// -// Cleanup -// -void ShutDown ( ESContext *esContext ) -{ - UserData *userData = esContext->userData; - - // Delete texture object - glDeleteTextures ( 1, &userData->textureId ); - - // Delete program object - glDeleteProgram ( userData->programObject ); -} - - -int main ( int argc, char *argv[] ) -{ - ESContext esContext; - UserData userData; - - esInitContext ( &esContext ); - esContext.userData = &userData; - - esCreateWindow ( &esContext, TEXT("MipMap 2D"), 320, 240, ES_WINDOW_RGB ); - - if ( !Init ( &esContext ) ) - return 0; - - esRegisterDrawFunc ( &esContext, Draw ); - - esMainLoop ( &esContext ); - - ShutDown ( &esContext ); -} |