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Diffstat (limited to 'third_party/gles2_book/Common/Include/esUtil.h')
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diff --git a/third_party/gles2_book/Common/Include/esUtil.h b/third_party/gles2_book/Common/Include/esUtil.h new file mode 100644 index 0000000..a1a72c4 --- /dev/null +++ b/third_party/gles2_book/Common/Include/esUtil.h @@ -0,0 +1,191 @@ +// +// 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 +// + +// +/// \file ESUtil.h +/// \brief A utility library for OpenGL ES. This library provides a +/// basic common framework for the example applications in the +/// OpenGL ES 2.0 Programming Guide. +// +#ifndef ESUTIL_H +#define ESUTIL_H + +/// +// Includes +// +#include <GLES2/gl2.h> + +#ifdef __cplusplus +extern "C" { +#endif // __cplusplus + +#ifndef FALSE +#define FALSE 0 +#endif // FALSE +#ifndef TRUE +#define TRUE 1 +#endif // TRUE + +typedef struct +{ + GLfloat m[4][4]; +} ESMatrix; + +typedef struct +{ + /// Put your user data here... + void* userData; + + /// Window width + GLint width; + + /// Window height + GLint height; +} ESContext; + +// +/// +/// \brief Initialize ES framework context. This must be called before calling any other functions. +/// \param esContext Application context +// +extern void esInitContext ( ESContext *esContext ); + +// +/// \brief Log a message to the debug output for the platform +/// \param formatStr Format string for error log. +// +extern void esLogMessage ( const char *formatStr, ... ); + +// +/// +/// \brief Load a shader, check for compile errors, print error messages to output log +/// \param type Type of shader (GL_VERTEX_SHADER or GL_FRAGMENT_SHADER) +/// \param shaderSrc Shader source string +/// \return A new shader object on success, 0 on failure +// +extern GLuint esLoadShader ( GLenum type, const char *shaderSrc ); + +// +/// +/// \brief Load a vertex and fragment shader, create a program object, link program. +/// Errors output to log. +/// \param vertShaderSrc Vertex shader source code +/// \param fragShaderSrc Fragment shader source code +/// \return A new program object linked with the vertex/fragment shader pair, 0 on failure +// +extern GLuint esLoadProgram ( const char *vertShaderSrc, const char *fragShaderSrc ); + + +// +/// \brief Generates geometry for a sphere. Allocates memory for the vertex data and stores +/// the results in the arrays. Generate index list for a TRIANGLE_STRIP +/// \param numSlices The number of slices in the sphere +/// \param vertices If not NULL, will contain array of float3 positions +/// \param normals If not NULL, will contain array of float3 normals +/// \param texCoords If not NULL, will contain array of float2 texCoords +/// \param indices If not NULL, will contain the array of indices for the triangle strip +/// \return The number of indices required for rendering the buffers (the number of indices stored in the indices array +/// if it is not NULL ) as a GL_TRIANGLE_STRIP +// +extern int esGenSphere ( int numSlices, float radius, GLfloat **vertices, GLfloat **normals, + GLfloat **texCoords, GLuint **indices ); + +// +/// \brief Generates geometry for a cube. Allocates memory for the vertex data and stores +/// the results in the arrays. Generate index list for a TRIANGLES +/// \param scale The size of the cube, use 1.0 for a unit cube. +/// \param vertices If not NULL, will contain array of float3 positions +/// \param normals If not NULL, will contain array of float3 normals +/// \param texCoords If not NULL, will contain array of float2 texCoords +/// \param indices If not NULL, will contain the array of indices for the triangle strip +/// \return The number of indices required for rendering the buffers (the number of indices stored in the indices array +/// if it is not NULL ) as a GL_TRIANGLES +// +extern int esGenCube ( float scale, GLfloat **vertices, GLfloat **normals, + GLfloat **texCoords, GLuint **indices ); + +// +/// \brief Loads a 24-bit TGA image from a file +/// \param fileName Name of the file on disk +/// \param width Width of loaded image in pixels +/// \param height Height of loaded image in pixels +/// \return Pointer to loaded image. NULL on failure. +// +extern char* esLoadTGA ( char *fileName, int *width, int *height ); + + +// +/// \brief multiply matrix specified by result with a scaling matrix and return new matrix in result +/// \param result Specifies the input matrix. Scaled matrix is returned in result. +/// \param sx, sy, sz Scale factors along the x, y and z axes respectively +// +extern void esScale(ESMatrix *result, GLfloat sx, GLfloat sy, GLfloat sz); + +// +/// \brief multiply matrix specified by result with a translation matrix and return new matrix in result +/// \param result Specifies the input matrix. Translated matrix is returned in result. +/// \param tx, ty, tz Scale factors along the x, y and z axes respectively +// +extern void esTranslate(ESMatrix *result, GLfloat tx, GLfloat ty, GLfloat tz); + +// +/// \brief multiply matrix specified by result with a rotation matrix and return new matrix in result +/// \param result Specifies the input matrix. Rotated matrix is returned in result. +/// \param angle Specifies the angle of rotation, in degrees. +/// \param x, y, z Specify the x, y and z coordinates of a vector, respectively +// +extern void esRotate(ESMatrix *result, GLfloat angle, GLfloat x, GLfloat y, GLfloat z); + +// +// \brief multiply matrix specified by result with a perspective matrix and return new matrix in result +/// \param result Specifies the input matrix. new matrix is returned in result. +/// \param left, right Coordinates for the left and right vertical clipping planes +/// \param bottom, top Coordinates for the bottom and top horizontal clipping planes +/// \param nearZ, farZ Distances to the near and far depth clipping planes. Both distances must be positive. +// +extern void esFrustum(ESMatrix *result, float left, float right, float bottom, float top, float nearZ, float farZ); + +// +/// \brief multiply matrix specified by result with a perspective matrix and return new matrix in result +/// \param result Specifies the input matrix. new matrix is returned in result. +/// \param fovy Field of view y angle in degrees +/// \param aspect Aspect ratio of screen +/// \param nearZ Near plane distance +/// \param farZ Far plane distance +// +extern void esPerspective(ESMatrix *result, float fovy, float aspect, float nearZ, float farZ); + +// +/// \brief multiply matrix specified by result with a perspective matrix and return new matrix in result +/// \param result Specifies the input matrix. new matrix is returned in result. +/// \param left, right Coordinates for the left and right vertical clipping planes +/// \param bottom, top Coordinates for the bottom and top horizontal clipping planes +/// \param nearZ, farZ Distances to the near and far depth clipping planes. These values are negative if plane is behind the viewer +// +extern void esOrtho(ESMatrix *result, float left, float right, float bottom, float top, float nearZ, float farZ); + +// +/// \brief perform the following operation - result matrix = srcA matrix * srcB matrix +/// \param result Returns multiplied matrix +/// \param srcA, srcB Input matrices to be multiplied +// +extern void esMatrixMultiply(ESMatrix *result, ESMatrix *srcA, ESMatrix *srcB); + +// +//// \brief return an indentity matrix +//// \param result returns identity matrix +// +extern void esMatrixLoadIdentity(ESMatrix *result); + +#ifdef __cplusplus +} +#endif // __cplusplus + +#endif // ESUTIL_H |