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testegl: do matrix mutlplication in the shader

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See https://bugzilla.gnome.org/show_bug.cgi?id=728940
This commit is contained in:
Julien Isorce 2014-06-25 10:19:54 +01:00
parent 91c6e34217
commit 3d0b891e42
1 changed files with 46 additions and 70 deletions
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116
examples/egl/testegl.c
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@ -178,60 +178,6 @@ gst_gl_matrix_translate (GstGLMatrix * matrix, GLfloat tx, GLfloat ty,
(matrix->m[0][3] * tx + matrix->m[1][3] * ty + matrix->m[2][3] * tz);
}
static void
gst_gl_matrix_rotate (GstGLMatrix * matrix, GLfloat angle, GLfloat x, GLfloat y,
GLfloat z)
{
GLfloat sinAngle, cosAngle;
GLfloat mag = sqrtf (x * x + y * y + z * z);
sinAngle = sinf (angle * M_PI / 180.0f);
cosAngle = cosf (angle * M_PI / 180.0f);
if (mag > 0.0f) {
GLfloat xx, yy, zz, xy, yz, zx, xs, ys, zs;
GLfloat oneMinusCos;
GstGLMatrix rotMat;
x /= mag;
y /= mag;
z /= mag;
xx = x * x;
yy = y * y;
zz = z * z;
xy = x * y;
yz = y * z;
zx = z * x;
xs = x * sinAngle;
ys = y * sinAngle;
zs = z * sinAngle;
oneMinusCos = 1.0f - cosAngle;
rotMat.m[0][0] = (oneMinusCos * xx) + cosAngle;
rotMat.m[0][1] = (oneMinusCos * xy) - zs;
rotMat.m[0][2] = (oneMinusCos * zx) + ys;
rotMat.m[0][3] = 0.0f;
rotMat.m[1][0] = (oneMinusCos * xy) + zs;
rotMat.m[1][1] = (oneMinusCos * yy) + cosAngle;
rotMat.m[1][2] = (oneMinusCos * yz) - xs;
rotMat.m[1][3] = 0.0f;
rotMat.m[2][0] = (oneMinusCos * zx) - ys;
rotMat.m[2][1] = (oneMinusCos * yz) + xs;
rotMat.m[2][2] = (oneMinusCos * zz) + cosAngle;
rotMat.m[2][3] = 0.0f;
rotMat.m[3][0] = 0.0f;
rotMat.m[3][1] = 0.0f;
rotMat.m[3][2] = 0.0f;
rotMat.m[3][3] = 1.0f;
gst_gl_matrix_multiply (matrix, &rotMat, matrix);
}
}
static void
gst_gl_matrix_frustum (GstGLMatrix * matrix, GLfloat left, GLfloat right,
GLfloat bottom, GLfloat top, GLfloat nearZ, GLfloat farZ)
@ -281,11 +227,34 @@ gst_gl_matrix_perspective (GstGLMatrix * matrix, GLfloat fovy, GLfloat aspect,
static const gchar *cube_v_src =
"attribute vec4 a_position; \n"
"attribute vec2 a_texCoord; \n"
"uniform mat4 u_matrix; \n"
"uniform float u_rotx; \n"
"uniform float u_roty; \n"
"uniform float u_rotz; \n"
"uniform mat4 u_modelview; \n"
"uniform mat4 u_projection; \n"
"varying vec2 v_texCoord; \n"
"void main() \n"
"{ \n"
" gl_Position = u_matrix * a_position; \n"
" float PI = 3.14159265; \n"
" float xrot = u_rotx*2.0*PI/360.0; \n"
" float yrot = u_roty*2.0*PI/360.0; \n"
" float zrot = u_rotz*2.0*PI/360.0; \n"
" mat4 matX = mat4 ( \n"
" 1.0, 0.0, 0.0, 0.0, \n"
" 0.0, cos(xrot), sin(xrot), 0.0, \n"
" 0.0, -sin(xrot), cos(xrot), 0.0, \n"
" 0.0, 0.0, 0.0, 1.0 ); \n"
" mat4 matY = mat4 ( \n"
" cos(yrot), 0.0, -sin(yrot), 0.0, \n"
" 0.0, 1.0, 0.0, 0.0, \n"
" sin(yrot), 0.0, cos(yrot), 0.0, \n"
" 0.0, 0.0, 0.0, 1.0 ); \n"
" mat4 matZ = mat4 ( \n"
" cos(zrot), sin(zrot), 0.0, 0.0, \n"
" -sin(zrot), cos(zrot), 0.0, 0.0, \n"
" 0.0, 0.0, 1.0, 0.0, \n"
" 0.0, 0.0, 0.0, 1.0 ); \n"
" gl_Position = u_projection * u_modelview * matZ * matY * matX * a_position;\n"
" v_texCoord = a_texCoord; \n"
"} \n";
@ -323,8 +292,12 @@ typedef struct
GLint fshader;
GLint program;
GLint u_modelviewprojectionmatrix;
GLint u_modelviewmatrix;
GLint u_projectionmatrix;
GLint s_texture;
GLint u_rotx;
GLint u_roty;
GLint u_rotz;
GstGLMatrix modelview;
GstGLMatrix projection;
@ -558,8 +531,15 @@ init_model_proj (APP_STATE_T * state)
glUseProgram (state->program);
state->u_modelviewprojectionmatrix =
glGetUniformLocation (state->program, "u_matrix");
state->u_rotx = glGetUniformLocation (state->program, "u_rotx");
state->u_roty = glGetUniformLocation (state->program, "u_roty");
state->u_rotz = glGetUniformLocation (state->program, "u_rotz");
state->u_modelviewmatrix =
glGetUniformLocation (state->program, "u_modelview");
state->u_projectionmatrix =
glGetUniformLocation (state->program, "u_projection");
state->s_texture = glGetUniformLocation (state->program, "s_texture");
@ -670,9 +650,6 @@ inc_and_wrap_angle (GLfloat angle, GLfloat angle_inc)
static void
redraw_scene (APP_STATE_T * state)
{
GstGLMatrix modelview;
GstGLMatrix modelviewprojection;
glBindFramebuffer (GL_FRAMEBUFFER, 0);
glEnable (GL_CULL_FACE);
@ -694,16 +671,15 @@ redraw_scene (APP_STATE_T * state)
glBindTexture (GL_TEXTURE_2D, state->tex);
glUniform1i (state->s_texture, 0);
memcpy (&modelview, &state->modelview, sizeof (GstGLMatrix));
gst_gl_matrix_rotate (&modelview, state->rot_angle_x, 1.0f, 0.0f, 0.0f);
gst_gl_matrix_rotate (&modelview, state->rot_angle_y, 0.0f, 1.0f, 0.0f);
gst_gl_matrix_rotate (&modelview, state->rot_angle_z, 0.0f, 0.0f, 1.0f);
glUniform1f (state->u_rotx, state->rot_angle_x);
glUniform1f (state->u_roty, state->rot_angle_y);
glUniform1f (state->u_rotz, state->rot_angle_z);
gst_gl_matrix_load_identity (&modelviewprojection);
gst_gl_matrix_multiply (&modelviewprojection, &modelview, &state->projection);
glUniformMatrix4fv (state->u_modelviewmatrix, 1, GL_FALSE,
&state->modelview.m[0][0]);
glUniformMatrix4fv (state->u_modelviewprojectionmatrix, 1, GL_FALSE,
&modelviewprojection.m[0][0]);
glUniformMatrix4fv (state->u_projectionmatrix, 1, GL_FALSE,
&state->projection.m[0][0]);
/* draw first 4 vertices */
glDrawArrays (GL_TRIANGLE_STRIP, 0, 4);