C++ GLShader::uniform方法代码示例

/**
* Prepare to run the intro
**/
void Intro::doit()
{
	GLShader *shader;

	if (sg->music != NULL) {
		GEng()->audio->playSong(sg);
	}

	start = SDL_GetTicks();
	lasttime = 0;

	CHECK_OPENGL_ERROR

	// Find 'basic' shader
	map<int, GLShader*>::const_iterator pos = render->shaders.find(SHADER_BASIC);
	if (pos == render->shaders.end()) {
		assert(false);
	} else {
		shader = pos->second;
	}

	// Set shader and uniforms
	glUseProgram(shader->p());
	glm::mat4 projection = glm::ortho<float>(
		0.0f, static_cast<float>(this->render->getWidth()),
		static_cast<float>(this->render->getHeight()), 0.0f,
		1.0f, -1.0f
	);
	glUniformMatrix4fv(shader->uniform("uMVP"), 1, GL_FALSE, &projection[0][0]);
	glUniform1i(shader->uniform("uTex"), 0);

	CHECK_OPENGL_ERROR

	this->updateUI();
}

/**
* Draws a string.
*
* NOTE: You normally won't use this function to draw text since
*       Graphics contains better functions for drawing text.
*
* @param graphics A Graphics object to use for drawing.
* @param text The string to draw.
* @param x The x coordinate where to draw the string.
* @param y The y coordinate where to draw the string.
*/
void OpenGLFont::drawString(gcn::Graphics* graphics, const std::string& text, int x, int y, float r, float g, float b, float a)
{
	float xx, yy;

	if (this->pmpl->font_vbo == 0) {
		glGenVertexArrays(1, &this->pmpl->font_vao);
		glGenBuffers(1, &this->pmpl->font_vbo);
	}

	glBindVertexArray(this->pmpl->font_vao);
	glEnable(GL_BLEND);

	// Set up shader
	GLShader* shader = this->render->shaders[SHADER_TEXT];
	glUseProgram(shader->p());
	glUniform1i(shader->uniform("uTex"), 0);
	glUniform4f(shader->uniform("uColor"), r, g, b, a);

	if (graphics == NULL) {
		// If in standard mode, use the values as-is
		xx = (float)x;
		yy = (float)y;
		glUniformMatrix4fv(shader->uniform("uMVP"), 1, GL_FALSE, glm::value_ptr(this->render->ortho));

	} else {
		// If in Guichan mode, use the current clip area
		const gcn::ClipRectangle& top = graphics->getCurrentClipArea();
		xx = (float)(x + top.xOffset);
		yy = (float)(y + top.yOffset) + this->size;
		glUniformMatrix4fv(shader->uniform("uMVP"), 1, GL_FALSE, glm::value_ptr(this->render->ortho_guichan));
	}

	// Render each character
	const char* ptr = text.c_str();
	size_t textlen = strlen(ptr);
	while (textlen > 0) {
		Uint32 c = UTF8_getch(&ptr, &textlen);
		if (c == UNICODE_BOM_NATIVE || c == UNICODE_BOM_SWAPPED) {
			continue;
		}
		this->renderCharacter(c, xx, yy);
	}

	glDisable(GL_BLEND);
	CHECK_OPENGL_ERROR;
}

/**
* Create a shader, optimised for the specific splat rendering used
**/
GLShader* RendererHeightmap::createShader(RenderOpenGL* render, Heightmap* heightmap)
{
    CHECK_OPENGL_ERROR;

    GLShader* s = new GLShader(0);

    char* vertex_code = s->loadCodeFile("phong_static.glslv");

    GLuint vertex = s->createShader(GL_VERTEX_SHADER, vertex_code);
    free(vertex_code);
    if (vertex == 0) {
        GL_LOG("Invalid vertex shader");
        return NULL;
    }

    char* base_fragment_code = s->loadCodeFile("phong_splat.glslf");
    char* diffuse_code = RendererHeightmap::createShaderFunction_diffuseColor(heightmap);

    const char* strings[3];
    strings[0] = "#version 130\n";
    strings[1] = base_fragment_code;
    strings[2] = diffuse_code;

    GLuint fragment = s->createShader(GL_FRAGMENT_SHADER, 3, strings);
    free(base_fragment_code);
    free(diffuse_code);
    if (fragment == 0) {
        glDeleteShader(vertex);
        GL_LOG("Invalid fragment shader");
        return NULL;
    }

    bool result = s->createProgFromShaders(vertex, fragment);

    glDeleteShader(vertex);
    glDeleteShader(fragment);

    if (!result) {
        return NULL;
    }

    glUseProgram(s->p());
    glUniform1i(s->uniform("uTex"), 0);
    glUniform1i(s->uniform("uShadowMap"), 1);
    glUniform1i(s->uniform("uNormal"), 2);
    glUniform1i(s->uniform("uLightmap"), 3);
    glUniform1i(s->uniform("uDayNight"), 4);
    glUniform1i(s->uniform("uAlphaMap"), 0);
    glUniform1i(s->uniform("uLayers[0]"), 5);
    glUniform1i(s->uniform("uLayers[1]"), 6);
    glUniform1i(s->uniform("uLayers[2]"), 7);
    glUniform1i(s->uniform("uLayers[3]"), 8);
    glUniform1i(s->uniform("uLightmap"), 9);
    glUniform1i(s->uniform("uDetail[0]"), 10);
    glUniform1i(s->uniform("uDetail[1]"), 11);
    glUniform1i(s->uniform("uDetail[2]"), 12);
    glUniform1i(s->uniform("uDetail[3]"), 13);

    CHECK_OPENGL_ERROR;

    return s;
}